Ista 4.39.20 [portable] Download May 2026

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# Launch ISTA 4.39.20 with temp cleanup $istaPath = "C:\EC-Apps\ISTA\ISTAGUI.exe" $logPath = "$env:APPDATA\ISTA\Logs" if (Test-Path $logPath) { Remove-Item "$logPath*" -Recurse -Force -ErrorAction SilentlyContinue Write-Host "Cleaned ISTA logs" } ista 4.39.20 download