pacman -R mingw-w64-x86_64-hoge
$ wget http://repo.msys2.org/mingw/x86_64/mingw-w64-x86_64-hoge-any.pkg.tar.xz
$ pacman -U mingw-w64-x86_64-hoge-any.pkg.tar.xz
以下、まだ途中
$wc = new-object System.Net.WebClient
$webRequest = [System.Net.WebRequest]::Create($url)
=> sshやscpで行ける