Hello and Welcome to Legit!
What Viewsat files are you looking for? The Viewsat Ultra is over ten years old. It can still be used for FTA, but not in HD.
I created a package for the Viewsat Ultra with Factory file, RS232 Loader, North America UDF sat list and cleaner so you can bring back to factory your Viewsat Ultra. Download from here. Hope it helps! Good Luck!