Gets all of the files from the public or test StarCitizen manifests and downloads them to $directory (prompts if not imported).

Get-StarCitizen.ps1

function Get-StarCitizenManifest {
    [CmdletBinding(SupportsShouldProcess)]
    param()
    $return = Invoke-WebRequest -Uri 'http://manifest.robertsspaceindustries.com/Launcher/_LauncherInfo' -OutFile $env:temp/launcherInfo
    Get-Content -Path $env:temp/launcherInfo | ConvertFrom-StringData
}

function Get-StarCitizenFiles {
    [CmdletBinding(SupportsShouldProcess)]
    param(
        [Parameter(Mandatory)][System.String]
        $destination,
        [ValidateSet('public','test')][System.String]
        $version = 'public',
        [switch]$force
    )
    begin {
        $Manifest = Get-StarCitizenManifest
        switch ($version) {
            public {$fileList = $Manifest.Public_fileIndex}
            test   {$fileList = $Manifest.Test_fileIndex}
        }
        if (!(Test-Path $destination -PathType Container)) {
            Write-Warning 'Directory does not exist. Creating it now!'
            try { 
                New-Item -Path $destination -ItemType Directory
            }
            catch {
                Write-Error "Creating $destination failed."
                break
            }
        }
        Write-Verbose "Grabbing File Listing for v$((Split-Path $fileList -Leaf).SubString(0,6))"
        $fileData = Invoke-WebRequest $fileList | ConvertFrom-Json
        $server = ($fileData.webseed_urls | Get-Random) + '/' + ($fileData.key_prefix)

        if ((Get-PSDrive ($destination.Substring(0,1)) -OutVariable $null).Free -lt $fileData.byte_count_total) {
            if (!$force) {
                Write-Warning 'Not enough room to download this on the targeted drive. Choose another location, or run with -force!'
                break
            }
        }
    }
    process {
        foreach ($file in $fileData.file_list) { 
            $file = $file | Select @{name='local';expression={Join-Path $destination $_}},@{name='url';expression={"$server/$_"}}
            $i++
            Write-Progress -Activity 'Downloading Star Citizen' -CurrentOperation "Downloading file $i/$($fileData.file_count_total) [$($file.local)]" -Id 0 -ParentId -1 -PercentComplete (100*($i)/$fileData.file_count_total-1)
            if($PSCmdlet.ShouldProcess($file.url, 'Download')) {
                try { 
                    if (!(Test-Path (Split-Path $file.local -Parent))) {New-Item (Split-Path $file.local -Parent) -ItemType Directory | Out-Null}
                    if (!(Test-Path $file.local)) {Invoke-WebRequest -Uri $file.url -OutFile $file.local}
                }
                catch {
                    Write-Error "$($file.url) failed to download."
                }
            }
        }
    }
}

if ($MyInvocation.InvocationName -NE '.') {Get-StarCitizenFiles}