arc-update.ps

#Modify as required. Points to the default install location
$GW2Path = "C:\Program Files\Guild Wars 2\"

#Don't change these paths unless arc does
$md5sum = 'https://www.deltaconnected.com/arcdps/x64/d3d9.dll.md5sum'
$d3d9 = 'https://www.deltaconnected.com/arcdps/x64/d3d9.dll'

#And this one unless ANet does
$gw = 'Gw2-64'

function Get-ArcDps
{
    write-host 'Downloading ArcDps'

    $d3d9Temp = New-TemporaryFile
    Invoke-WebRequest -Uri $d3d9 -OutFile $d3d9Temp.FullName
    Copy-Item $d3d9Temp.FullName "$($GW2Path)\bin64\d3d9.dll" -Force
    Remove-Item $d3d9Temp.FullName -Force

    write-host 'Completed ArcDps install'
}

function Invoke-ArcDpsCheck
{
    $date = (Get-Date -format "MM-dd-yyyy")

    if((Get-Process $gw -EA 0).Count -gt 0)
    {
        Exit
    }

    $ignoreCase = [System.StringComparison]::InvariantCultureIgnoreCase
    $md5Temp = New-TemporaryFile
    Invoke-WebRequest -Uri $md5sum -OutFile $md5Temp.FullName
    $md5Hash = Get-Content $md5Temp
    $md5Hash = $md5Hash.Substring(0,$md5Hash.IndexOf(' '))
    $fileExists = Test-Path "$($GW2Path)\bin64\d3d9.dll"

    if($fileExists)
    {
        $md5D3d9m = Get-FileHash "$($GW2Path)\bin64\d3d9.dll" -Algorithm MD5

        if(!$md5D3d9m.Hash.Equals($md5Hash,$ignoreCase))
        {
            Write-Host 'ArcDps is out of date'

            try
            {
            Rename-Item "$($GW2Path)\bin64\d3d9.dll" -NewName "$($GW2Path)\bin64\d3d9.$date" -Force

            }
            catch {}

            Get-ArcDps
        }
        else
        {
            write-host 'ArcDps is up to date'
        }
    }
    else
    {
        Get-ArcDps
    }
}


Invoke-ArcDpsCheck