Can't Update to Sonoma "The update cannot be installed on this computer"

I've been using my computer with Ventura no problems, installing every single update without issues. I always keep OpenCore updated (now to 0.9.6) and kext updated. Never a problem.

Now if I try to upgrade to Sonoma I get this error as the update starts to download:

The update cannot be installed on this computer
An error occurred while downloading the selected updates.
Please check your internet connection and try again.

I did a lot of research but did not find any solution...

Tonymacx86