こんにちは。
Vim - KaoriYa (Windwos用) を自動でインストールする PowerShell スクリプトを作ってみました¹。内部で netupvim に頼っています。

合わせて、Chocolatey および less もインストールし、less の中からは Vim へ遷移できるようにしました（キー入力v）。

PS> .\install_vim.ps1
(installing vim.exe into C:\commands\vim\)
  :
  :

インストール後、使ってみると、

PS> vi install_vim.ps1
PS> less install_vim.ps1

install_vim.ps1

# Encoding::Shift-JIS

function Check-Privilege {
  if (([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(`
        [Security.Principal.WindowsBuiltInRole] "Administrator")) {
    if ((Get-ExecutionPolicy) -eq "Restricted") {
      Write-Warning "Set-ExecutionPolicy RemoteSigned  を PowerShell 上で事前に実行してください" -ForegroundColor "Yellow"
      exit 1
    }
  }
  else {
      Write-Warning "PowerShell を管理者権限で実行してください" -ForegroundColor "Yellow"
    exit 1
  }
}

function Check-Profile {
  if (!(Test-Path "$profile")) { 
    new-item -type file -force $profile | out-null
  }
}

function Get-UniqueDir($parentPath) {
  $path = $null
  Do {
    $path = Join-Path $parentPath ([IO.Path]::GetRandomFileName())
  } while (Test-Path $path)
  return $path
}

function Make-Dir($dir) {
  $dirinfo = $null
  if (!(Test-Path "$dir")) { 
    mkdir "$dir" | out-null
  }
  return $dir
}

function Create-Shortcut($TargetFile, $dir) {
  $command = (Get-Item $TargetFile).BaseName
  $ShortcutFile = "$($dir)\$($command).lnk"
  $WScriptShell = New-Object -ComObject WScript.Shell
  $Shortcut = $WScriptShell.CreateShortcut($ShortcutFile)
  $Shortcut.TargetPath = $TargetFile
  $Shortcut.Save()
}

function Set-ProfileforVim($vim) {
  $lines = @"
set shell=powershell.exe
`$env:VISUAL = `"```"$vim```"`"
set-alias vi `"$vim`"
"@
  echo $lines | Out-File $profile -Append -Encoding ASCII
  . $profile
}

# Vim - KaoriYa
# https://www.kaoriya.net/software/vim/
function Install-Vim {
  $ver="1.2"
  $vimDir="C:\Program Files\vim"
  $installer = "UPDATE.bat"
  $executable = "vim.exe"
  $executable_gvim = "gvim.exe"
  $startmenu = "C:\ProgramData\Microsoft\Windows\Start Menu\Programs"
  $url = "https://github.com/koron/netupvim/releases/download/v$($ver)/netupvim-v$($ver).zip" 
  Write-host "(installing $($executable) into $($vimDir)\)"
  $wc = new-object System.Net.WebClient
  $uri = New-Object System.Uri($url)
  $tempDir = (Make-Dir (Get-UniqueDir ([IO.Path]::GetTempPath())))  
  $downloaded = (Join-Path $tempDir (Split-Path $uri.AbsolutePath -Leaf))
  $wc.DownloadFile($uri, $downloaded)
  $shell_app = new-object -com shell.application
  Make-Dir "$vimDir"
  $tgtDir = $shell_app.namespace($vimDir)
  $tgtDir.Copyhere($shell_app.namespace("$downloaded").items())
  remove-item -path $tempDir -recurse -force
  cmd /c (Join-Path $vimDir $installer)
  Set-ProfileforVim (Join-Path $vimDir $executable)
  Create-Shortcut (Join-Path $vimDir $executable_gvim) $startmenu
}

# Chocolatey
# https://chocolatey.org/packages
function Install-Chocolatey {
  set ChocolateyInstall=C:\ProgramData\chocolatey
  $url = 'https://chocolatey.org/install.ps1'
  $wc = new-object System.Net.WebClient
  Invoke-Expression ($wc.DownloadString($url))
  choco list -lo
}

Check-Privilege
Check-Profile
Install-Vim
Install-Chocolatey
choco install -y less
exit

同梱の gvim (GUI 版) も合わせて自動でインストールされます。 ↩