textlive2020を消して管理者権限でコマンドプロンプトを行った結果です。
  ログを C:\texlive\bibunsho_log.txt に作成します。
  C:\Users\KA\Desktop\新しいフォルダー\texlive\texlive2020-r56669.iso を C:\Users\KA\AppData\Local\Temp\d0nchtg1.3x4\texlive2020-r56669.iso にコピーしています……
  **************************************************************************************************
  コピーを終了しました。
  ISO ファイルをマウントします。
  TeX Live のインストールを開始中……
  
  Loading E:/tlpkg/texlive.tlpdb
  Installing TeX Live 2020 from: E: (not verified)
  Platform: win32 => 'Windows'
  Distribution: inst (compressed)
  Directory for temporary files: C:\Users\KA\AppData\Local\Temp\w2RkQXSYgt
   ======================> TeX Live installation procedure <=====================
  
  ======> Letters/digits in <angle brackets> indicate <=======
  ======> menu items for actions or customizations <=======
  
   Detected platform: Windows
   
   <B> set binary platforms: 1 out of 16
  
   <S> set installation scheme: scheme-full
  
   <C> set installation collections:
   41 collections out of 41, disk space required: 7269 MB
  
   <D> set directories:
   TEXDIR (the main TeX directory):
   C:/texlive/2020
   TEXMFLOCAL (directory for site-wide local files):
   C:/texlive/texmf-local
   TEXMFSYSVAR (directory for variable and automatically generated data):
   C:/texlive/2020/texmf-var
   TEXMFSYSCONFIG (directory for local config):
   C:/texlive/2020/texmf-config
   TEXMFVAR (personal directory for variable and automatically generated data):
   ~/.texlive2020/texmf-var
   TEXMFCONFIG (personal directory for local config):
   ~/.texlive2020/texmf-config
   TEXMFHOME (directory for user-specific files):
   ~/texmf
  
   <O> options:
   [ ] use letter size instead of A4 by default
   [X] allow execution of restricted list of programs via \write18
   [X] create all format files
   [X] install macro/font doc tree
   [X] install macro/font source tree
   [X] adjust search path
   [1] add menu items, shortcuts, etc.
   [1] update file associations
   [X] make installation available to all users
   [X] install TeXworks front end
   [X] after install, set CTAN as source for package updates
  
   <V> set up for portable installation
  
  Actions:
   <I> start installation to hard disk
   <P> save installation profile to 'texlive.profile' and exit
   <H> help
   <Q> quit
  
  Enter command: ===============================================================================
  Directories customization:
  
   <1> TEXDIR: C:/texlive/2020
   main tree: C:/texlive/2020/texmf-dist
  
   <2> TEXMFLOCAL: C:/texlive/texmf-local
   <3> TEXMFSYSVAR: C:/texlive/2020/texmf-var
   <4> TEXMFSYSCONFIG: C:/texlive/2020/texmf-config
  
   <5> TEXMFVAR: ~/.texlive2020/texmf-var
   <6> TEXMFCONFIG: ~/.texlive2020/texmf-config
   <7> TEXMFHOME: ~/texmf
  
   Note: ~ will expand to %USERPROFILE%
  
  Actions:
   <R> return to main menu
   <Q> quit
  
  Enter command: New value for TEXDIR [C:/texlive/2020]: ===============================================================================
  Directories customization:
  
   <1> TEXDIR: C:/texlive/2020
   main tree: C:/texlive/2020/texmf-dist
  
   <2> TEXMFLOCAL: C:/texlive/texmf-local
   <3> TEXMFSYSVAR: C:/texlive/2020/texmf-var
   <4> TEXMFSYSCONFIG: C:/texlive/2020/texmf-config
  
   <5> TEXMFVAR: ~/.texlive2020/texmf-var
   <6> TEXMFCONFIG: ~/.texlive2020/texmf-config
   <7> TEXMFHOME: ~/texmf
  
   Note: ~ will expand to %USERPROFILE%
  
  Actions:
   <R> return to main menu
   <Q> quit
  
  Enter command: ======================> TeX Live installation procedure <=====================
  
  ======> Letters/digits in <angle brackets> indicate <=======
  ======> menu items for actions or customizations <=======
  
   Detected platform: Windows
   
   <B> set binary platforms: 1 out of 16
  
   <S> set installation scheme: scheme-full
  
   <C> set installation collections:
   41 collections out of 41, disk space required: 7269 MB
  
   <D> set directories:
   TEXDIR (the main TeX directory):
   C:/texlive/2020
   TEXMFLOCAL (directory for site-wide local files):
   C:/texlive/texmf-local
   TEXMFSYSVAR (directory for variable and automatically generated data):
   C:/texlive/2020/texmf-var
   TEXMFSYSCONFIG (directory for local config):
   C:/texlive/2020/texmf-config
   TEXMFVAR (personal directory for variable and automatically generated data):
   ~/.texlive2020/texmf-var
   TEXMFCONFIG (personal directory for local config):
   ~/.texlive2020/texmf-config
   TEXMFHOME (directory for user-specific files):
   ~/texmf
  
   <O> options:
   [ ] use letter size instead of A4 by default
   [X] allow execution of restricted list of programs via \write18
   [X] create all format files
   [X] install macro/font doc tree
   [X] install macro/font source tree
   [X] adjust search path
   [1] add menu items, shortcuts, etc.
   [1] update file associations
   [X] make installation available to all users
   [X] install TeXworks front end
   [X] after install, set CTAN as source for package updates
  
   <V> set up for portable installation
  
  Actions:
   <I> start installation to hard disk
   <P> save installation profile to 'texlive.profile' and exit
   <H> help
   <Q> quit
  
  Enter command: Installing to: C:/texlive/2020
  Installing [0001/4062, time/total: ??:??/??:??]: texlive.infra [423k]
  tar: Could not create file tlpkg/gpg/pubring.gpg: Permission denied
  TLUtils::untar: E:\tlpkg\installer\tar.exe xmf C:\Users\KA\AppData\Local\Temp\w2RkQXSYgt\heqZB2OLPZ/texlive.infra.r56587.tar failed (in C:/texlive/2020)
  TLPDB::_install_data: untar failed for E:/archive/texlive.infra.r56587.tar.xz
  TLUtils::install_packages: Failed to install texlive.infra
  print() on closed filehandle PROFILE at E:\install-tl line 1925, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1926, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1927, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1928, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1936, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1937, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1931, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1935, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1935, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1935, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1935, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1935, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  print() on closed filehandle PROFILE at E:\install-tl line 1934, <STDIN> line 5.
  Installation failed.
  Rerunning the installer will try to restart the installation.
  TeX Live installer invocation: E:\install-tl -no-gui 
  Loading E:/tlpkg/texlive.tlpdb
  Installing TeX Live 2020 from: E: (not verified)
  Platform: win32 => 'Windows'
  Distribution: inst (compressed)
  Directory for temporary files: C:\Users\KA\AppData\Local\Temp\w2RkQXSYgt
  Installer revision: 55535
  Database revision: 56669
  Settings:
   TEXDIR: "C:/texlive/2020"
   TEXMFCONFIG: "~/.texlive2020/texmf-config"
   TEXMFHOME: "~/texmf"
   TEXMFLOCAL: "C:/texlive/texmf-local"
   TEXMFSYSCONFIG: "C:/texlive/2020/texmf-config"
   TEXMFSYSVAR: "C:/texlive/2020/texmf-var"
   TEXMFVAR: "~/.texlive2020/texmf-var"
   binary_aarch64-linux: ""
   binary_amd64-freebsd: ""
   binary_amd64-netbsd: ""
   binary_armhf-linux: ""
   binary_i386-cygwin: ""
   binary_i386-freebsd: ""
   binary_i386-linux: ""
   binary_i386-netbsd: ""
   binary_i386-solaris: ""
   binary_win32: "1"
   binary_x86_64-cygwin: ""
   binary_x86_64-darwin: ""
   binary_x86_64-darwinlegacy: ""
   binary_x86_64-linux: ""
   binary_x86_64-linuxmusl: ""
   binary_x86_64-solaris: ""
   collection-basic: "1"
   collection-bibtexextra: "1"
   collection-binextra: "1"
   collection-context: "1"
   collection-fontsextra: "1"
   collection-fontsrecommended: "1"
   collection-fontutils: "1"
   collection-formatsextra: "1"
   collection-games: "1"
   collection-humanities: "1"
   collection-langarabic: "1"
   collection-langchinese: "1"
   collection-langcjk: "1"
   collection-langcyrillic: "1"
   collection-langczechslovak: "1"
   collection-langenglish: "1"
   collection-langeuropean: "1"
   collection-langfrench: "1"
   collection-langgerman: "1"
   collection-langgreek: "1"
   collection-langitalian: "1"
   collection-langjapanese: "1"
   collection-langkorean: "1"
   collection-langother: "1"
   collection-langpolish: "1"
   collection-langportuguese: "1"
   collection-langspanish: "1"
   collection-latex: "1"
   collection-latexextra: "1"
   collection-latexrecommended: "1"
   collection-luatex: "1"
   collection-mathscience: "1"
   collection-metapost: "1"
   collection-music: "1"
   collection-pictures: "1"
   collection-plaingeneric: "1"
   collection-pstricks: "1"
   collection-publishers: "1"
   collection-texworks: "1"
   collection-wintools: "1"
   collection-xetex: "1"
   doc_splitting_supported: "1"
   inst_platform: "win32"
   instopt_adjustpath: "1"
   instopt_adjustrepo: "1"
   instopt_letter: ""
   instopt_portable: ""
   instopt_write18_restricted: "1"
   n_collections_available: "41"
   n_collections_selected: "41"
   n_systems_available: "16"
   n_systems_selected: "1"
   page: ""
   selected_scheme: "scheme-full"
   src_splitting_supported: "1"
   this_platform: "win32"
   tlpdbopt_autobackup: "1"
   tlpdbopt_backupdir: "tlpkg/backups"
   tlpdbopt_create_formats: "1"
   tlpdbopt_desktop_integration: "1"
   tlpdbopt_file_assocs: "1"
   tlpdbopt_generate_updmap: ""
   tlpdbopt_install_docfiles: "1"
   tlpdbopt_install_srcfiles: "1"
   tlpdbopt_location: "E:"
   tlpdbopt_post_code: "1"
   tlpdbopt_sys_bin: "/usr/local/bin"
   tlpdbopt_sys_info: "/usr/local/share/info"
   tlpdbopt_sys_man: "/usr/local/share/man"
   tlpdbopt_w32_multi_user: "1"
   total_size: "7269"
  Installing to: C:/texlive/2020
  E:\install-tl: Could not write to install-tl.log, so flushing messages to stderr.
  Making read-only
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  
  Making read-only
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  
  Making read-only
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  
  Making read-only
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  処理ファイル: .
  1 個のファイルが正常に処理されました。0 個のファイルを処理できませんでした
  
  Installing [0001/4062, time/total: ??:??/??:??]: texlive.infra [423k]
  TLUtils::untar: E:\tlpkg\installer\tar.exe xmf C:\Users\KA\AppData\Local\Temp\w2RkQXSYgt\heqZB2OLPZ/texlive.infra.r56587.tar failed (in C:/texlive/2020)
  TLPDB::_install_data: untar failed for E:/archive/texlive.infra.r56587.tar.xz
  TLUtils::install_packages: Failed to install texlive.infra
  Installation failed.
  Rerunning the installer will try to restart the installation.
  
  
  TeX Live のセットアップを終了しています……
  TeX Live のインストールでエラーが起こった可能性がありますが、残りのインストールを続行します。
  64bit バイナリをインストールします。
  tlmgr の repository 設定を更新……
  指定されたファイルが見つかりません。
  tlmgr の実行に失敗。
  パス 'C:\texlive\2020\bin\win32\nkf.exe' の一部が見つかりませんでした。
  nkf のセットアップに失敗。
  TeX2img のセットアップが完了。
  TeX のセットアップが完了しました。