Hi Peter,
When installing AMM I get an error "Unknown column 'category' in 'xxxx_advancedmodules'.
Checking in phpMyAdmin I only see 2 colums module_id and params.

Any thoughts on where to look for the cause and solution?

I had nothing installed and are on J4.
But ... this is a site I've migrated for a client. Not sure if anything happened is the years before.
Before migrating I did not see any of your extensions.

I have completely removed this table and cleaned the files and extension table.

This did the job.

Thanks for the tips.