Error Loading Add-ins

Hello All,

I am trying to get Eve plug-in for Excel working, but when I am trying to download it gives the message
Error loading add-ins.

my system:
Windows 11
Microsoft Office Professional plus 2021
Version 2311 (Build 17029.20108)

Can some one help?

it only works in Office 365, i had the same problem.

Correct, 365 support only. Some framework related update broke the code that we use to detect and display the error in the sidebar so everyone non-365 gets this hard error instead.