If you installed Windows 11 and something stopped working, you can follow this guide to downgrade to Windows 10 again.
\uD83D\uDCD8 Instructions
Start by asking IT if they can make the program work again.
If they recommend you to downgrade to Windows 10 again, please follow this guide:
https://www.digitaltrends.com/computing/how-to-downgrade-from-windows-11-to-windows-10/
Remember always to have backup! (save your files in Sharepoint)