RetroArch Core Downloader

$ZipNames = @(
    "atari800_libretro.dll.zip",
    "citra_libretro.dll.zip",
    "crocods_libretro.dll.zip",
    "desmume_libretro.dll.zip"
	"dolphin_libretro.dll.zip"
	"dosbox_pure_libretro.dll.zip"
	"ecwolf_libretro.dll.zip"
	"fbalpha2012_libretro.dll.zip"
	"fbneo_libretro.dll.zip"
	"fceumm_libretro.dll.zip"
	"flycast_libretro.dll.zip"
	"gearboy_libretro.dll.zip"
	"genesis_plus_gx_libretro.dll.zip"
	"genesis_plus_gx_wide_libretro.dll.zip"
	"mame_libretro.dll.zip"
	"mame2000_libretro.dll.zip"
	"mednafen_lynx_libretro.dll.zip"
	"mednafen_psx_hw_libretro.dll.zip"
	"mednafen_psx_libretro.dll.zip"
	"mednafen_saturn_libretro.dll.zip"
	"mednafen_vb_libretro.dll.zip"
	"mednafen_wswan_libretro.dll.zip"
	"mgba_libretro.dll.zip"
	"mupen64plus_next_libretro.dll.zip"
	"nestopia_libretro.dll.zip"
	"nxengine_libretro.dll.zip"
	"openlara_libretro.dll.zip"
	"opera_libretro.dll.zip"
	"parallel_n64_libretro.dll.zip"
	"pcsx_rearmed_libretro.dll.zip"
	"pcsx2_libretro.dll.zip"
	"picodrive_libretro.dll.zip"
	"ppsspp_libretro.dll.zip"
	"prosystem_libretro.dll.zip"
	"puae_libretro.dll.zip"
	"px68k_libretro.dll.zip"
	"retro8_libretro.dll.zip"
	"sameboy_libretro.dll.zip"
	"scummvm_libretro.dll.zip"
	"snes9x_libretro.dll.zip"
	"snes9x2002_libretro.dll.zip"
	"snes9x2005_libretro.dll.zip"
	"snes9x2005_plus_libretro.dll.zip"
	"snes9x2010_libretro.dll.zip"
	"stella_libretro.dll.zip"
	"stella2014_libretro.dll.zip"
	"vice_x64_libretro.dll.zip"
	"virtualjaguar_libretro.dll.zip"

)
$CoreDest = "${PSScriptRoot}\cores\"
$CoresBaseUri = "https://buildbot.libretro.com/nightly/windows/x86_64/latest/"
$LogDest = "${PSScriptRoot}\core_update.log"

try {
    Start-Transcript -Path $LogDest -UseMinimalHeader
}
catch [System.Management.Automation.ParameterBindingException] {
    Start-Transcript -Path $LogDest
}


foreach ($zip in $ZipNames)
{
    $params = @{
        "Uri" = ($CoresBaseUri + $zip)
        "OutFile" = ($CoreDest + $zip)
        "Verbose" = $true
    }
    try {
        Invoke-WebRequest @params
    }
    catch {
        continue
    }

    $params = @{
        "LiteralPath" = ($CoreDest + $zip)
        "DestinationPath" = $CoreDest
        "Force" = $true
        "Verbose" = $true
    }
    Expand-Archive @params
    Remove-Item ($CoreDest + $zip) -Verbose
}

Stop-Transcript

-----------------------------------------------------------------------------------
First half is a PowerShell command. Put it in your RetroArch folder with the file extension .ps1

-----------------------------------------------------------------------------------
This half is a .bat file. Also put this in your RetroArch folder.

PowerShell.exe Set-ExecutionPolicy Bypass

PowerShell.exe -command .\CoreDownloader.ps1

start "F:\Games\Steam\steamapps\common\RetroArch\retroarch.exe" /wait "C:\Program Files\SyncToy 2.1\SyncToyCmd.exe" -R
echo %errorlevel%

-----------------------------------------------------------------------------------
New Test Version:


$ZipNames = @(
    "atari800_libretro.dll.zip",
    "citra_libretro.dll.zip",
    "crocods_libretro.dll.zip",
    "desmume_libretro.dll.zip"
	"dolphin_libretro.dll.zip"
	"dosbox_pure_libretro.dll.zip"
	"ecwolf_libretro.dll.zip"
	"fbalpha2012_libretro.dll.zip"
	"fbneo_libretro.dll.zip"
	"fceumm_libretro.dll.zip"
	"flycast_libretro.dll.zip"
	"gearboy_libretro.dll.zip"
	"genesis_plus_gx_libretro.dll.zip"
	"genesis_plus_gx_wide_libretro.dll.zip"
	"mame_libretro.dll.zip"
	"mame2000_libretro.dll.zip"
	"mednafen_lynx_libretro.dll.zip"
	"mednafen_psx_hw_libretro.dll.zip"
	"mednafen_psx_libretro.dll.zip"
	"mednafen_saturn_libretro.dll.zip"
	"mednafen_vb_libretro.dll.zip"
	"mednafen_wswan_libretro.dll.zip"
	"mgba_libretro.dll.zip"
	"mupen64plus_next_libretro.dll.zip"
	"nestopia_libretro.dll.zip"
	"nxengine_libretro.dll.zip"
	"openlara_libretro.dll.zip"
	"opera_libretro.dll.zip"
	"parallel_n64_libretro.dll.zip"
	"pcsx_rearmed_libretro.dll.zip"
	"pcsx2_libretro.dll.zip"
	"picodrive_libretro.dll.zip"
	"ppsspp_libretro.dll.zip"
	"prosystem_libretro.dll.zip"
	"puae_libretro.dll.zip"
	"px68k_libretro.dll.zip"
	"retro8_libretro.dll.zip"
	"sameboy_libretro.dll.zip"
	"scummvm_libretro.dll.zip"
	"snes9x_libretro.dll.zip"
	"snes9x2002_libretro.dll.zip"
	"snes9x2005_libretro.dll.zip"
	"snes9x2005_plus_libretro.dll.zip"
	"snes9x2010_libretro.dll.zip"
	"stella_libretro.dll.zip"
	"stella2014_libretro.dll.zip"
	"vice_x64_libretro.dll.zip"
	"virtualjaguar_libretro.dll.zip"

)
$ZipNames = @(
    "gong_libretro.dll.zip",
    "squirreljme_libretro.dll.zip",
    "potator_libretro.dll.zip",
    "freeintv_libretro.dll.zip"
)
$CoreDest = "${PSScriptRoot}\cores\"
$CoresBaseUri = "https://buildbot.libretro.com/nightly/windows/x86_64/latest/"
$LogDest = "${PSScriptRoot}\core_update.log"

try
{
    Start-Transcript -Path $LogDest -UseMinimalHeader
}
catch [System.Management.Automation.ParameterBindingException]
{
    Start-Transcript -Path $LogDest
}


foreach ($zip in $ZipNames)
{
    $dll = $zip -replace '\.zip$', ''
    $params = @{
        "LiteralPath" = (Join-Path $CoreDest $dll)
        "ErrorAction" = "SilentlyContinue"
    }
    if (($creationTime = (Get-Item @params).CreationTime) -and
        (New-TimeSpan $creationTime (Get-Date)).Days -lt 7)
    {
        Write-Host "Skipping core ${dll}: It's not older than a week."
        continue
    }

    $params = @{
        "Uri"     = ($CoresBaseUri + $zip)
        "OutFile" = ($CoreDest + $zip)
        "Verbose" = $true
    }
    try
    {
        Invoke-WebRequest @params
    }
    catch
    {
        Write-Host "Skipping core ${dll}: Failed to download ${zip}."
        continue
    }

    $params = @{
        "LiteralPath"     = ($CoreDest + $zip)
        "DestinationPath" = $CoreDest
        "Force"           = $true
        "Verbose"         = $true
    }
    Expand-Archive @params
    Remove-Item ($CoreDest + $zip) -Verbose
}

Stop-Transcript