Script Updating Chocolatey Server with PowerShell

$dowload_folder = "C:\tools\chocolatey.server\download\"
$download_source = "https://chocolatey.org/api/v2/package/"
$package_folder = "C:\tools\chocolatey.server\App_Data\Packages\"
$choco_server = "http://localhost/chocolatey"
$choco_server_api_key = "REPLACE_WITH_API_KEY"
$downloaded_packages_items = Get-ChildItem -Path "$dowload_folder"
$downloaded_packages = @()
foreach ($l in $downloaded_packages_items){
	$downloaded_packages += $l.Name
}

$download_links = @()
foreach ($s in $software_packages){
	$download_links += $download_source + $s
}

$software_packages = @(
	"chocolatey-core.extension",
	"chocolatey-windowsupdate.extension",
	"googlechrome",
	"firefox",
	"7zip",
	"7zip.install",
	"notepadplusplus",
	"notepadplusplus.install",
	"putty",
	"putty.install",
)

$download_links | %{
	$uri = $_

	Write-Host "Waiting 22 seconds . . ."
	Start-Sleep -s 22
	$request = Invoke-WebRequest -Uri $uri -MaximumRedirection 0 -ErrorAction Ignore
	$location = $request.Headers.Location
	$repo_version = $location.SubString($location.LastIndexOf('/') + 1)
	$package = $repo_version -split '\.+[0-9]'
	$package = $package[0]
	$package_index = $package.length
	$version = $repo_version.substring($package_index)
	$version = $version.substring(1)
	$version = $version -replace ".{6}$" 
	$output = $dowload_folder + $location.SubString($location.LastIndexOf('/') + 1)

	$installed_packages = Get-ChildItem "$package_folder" | 
	Where-Object {$_.PSIsContainer} | 
	Foreach-Object {$_.Name}

	$installed_versions = Get-ChildItem "$package_folder$package" | 
	Where-Object {$_.PSIsContainer} | 
	Foreach-Object {$_.Name}

	Write-Host "`r`n"
	#Write-Host $package_index
	Write-Host "Repo File: " $repo_version
	Write-Host "Repo Package: " $package
	Write-Host "Repo Version: " $version

	if($repo_version -notin $downloaded_packages){
		Invoke-WebRequest -Uri $location -OutFile $output
		Write-Host "Waiting 60 seconds . . ." 
		Start-Sleep -s 60 
	}
	else{
		Write-Host $repo_version "is alreay downloaded to" $dowload_folder
		Write-Host "Skipping download of" $repo_version
	}

	if(($package -notin $installed_packages) -or ($version -notin $installed_versions)){
		choco push $dowload_folder$repo_version --source $choco_server --api-key=$choco_server_api_key     
	}
	else{
		Write-Host $repo_version "is alreay installed to" $package_folder
		Write-Host "Skipping install of" $repo_version
	}
}