Version Upgrade Deleted my Project

I’ve been working with Katalon Studio for a few years now on Windows 10.

As per request of the program, I upgraded to the latest version of Katalon (8.0.0).
When re-entering Katalon, none of my projects or TestObjects are available.

I cannot continue my job and have to work on something else while awaiting your response.
Please help me figure out if the items are all lost or restore the files and previous version?

Many thanks.