I hired a freelancer to fix the issue. Apparently, the download to install through the CMS was corrupted and it installed an older version instead of the newest. So, it crashed since our server is running PHP8. He uploaded from the download I did of the current version.

Can I close the thread?

same with me, site broken, had to restore it from backup

Can you give me the version number of the Add Animation add-on. This seems to be a bug already fixed.

0.9.7

I don't know how you got the old version. The latest version is 0.9.8.

freshly fetched from the Marketplace one hour ago, and afterwards appeared this way in the Dashboard

Sorry. I didn't update the version list, to the concrete cms version.

now it works, thank you

Yes, you can close it.