Clears SPD's cache and restarts the program.

clear-spd-cache.ps1

$spd = Get-Process | ? {$_.ProcessName -eq 'SPDESIGN'}
$spdPath = ${env:ProgramFiles(x86)} + '\Microsoft Office\Office15\SPDESIGN.EXE'

if ($spd -ne $null) {
    $spdPath = if ($spd.Path) { $spd.Path } # Else { ${env:ProgramFiles(x86)} + '\Microsoft Office\Office15\SPDESIGN.EXE' }
    $spd.Kill();
   
    while(!$spd.HasExited) {
        Start-Sleep 1000
    }
}

Remove-Item "$($env:USERPROFILE)\AppData\Local\Microsoft\WebsiteCache\*" -Recurse -Force
Remove-Item "$($env:APPDATA)\Microsoft\Web Server Extensions\Cache\*" -Recurse -Force
Remove-Item "$($env:APPDATA)\Microsoft\SharePoint Designer\ProxyAssemblyCache\*" -Recurse -Force -ErrorAction SilentlyContinue

Start-Process $spdPath