Hello,
I have the same problem. A soon as the Multi Widget Addon is installed on WordPress 6.5.5 is crashing.
Do you have any update on this case?
I just want to know because I have purchased a theme (Tameer Construction ProVersion: 1.1.2) which after installation is requiring the install the Multi Widget Addon plugin.
So now I am not sure if the purchased theme will work fully without the required plugin.
regards,
Mihai