Sorry for the delay, only had a bit of time to test it again tonight. , I deleted the old log, installed the plugin with composer, I cleared the cache and received an error in the front end showing the message:

Something went wrong while trying to load the full version of this site.

The backend shows up but the front is broken. In the log folder, no errors.

    Benito Have you enabled debug mode? In your config.php file, change the line that says debug=false to debug=true, then when the error appears, click on the DEBUG text that has now appeared beside the error message, and copy-and-paste the message here.

    Debug mode also sometimes solves the issue, so let us know.

    IMPORTANT: Disable debug mode once you are done, leaving it open can put your forum at risk.