Is there a way to have Tixati shut down the computer when finished downloading. If not that would be addition.

Ken

That's possible using the built-in scheduler.
Click ADD on the scheduler, a window will popup titled "add scheduler task".
In it, you have Actions and an ADD button right below it. Clicking it will open a menu.
Select Shutdown > Auto-Shutdown > Shut Down System When All Downloads Are Complete.

All downloads completed but PC won't shutdown.
Tixati v3.19 on Windows 10 v1909

You don't need to make a new Task in Scheduler. The system tray icon (right click) has all the same options for auto shutdown. I have never used it so no comment.