Why isn't de site working properly, since the changing of the domain?

Looking for modules not possible, finding the forum is difficult.

and so on and on

There are problems with an update that was performed, and it seems they've given up.
I can only say that it's due to the order and number of fields in the database structure. It's a bit complicated to fix on a site with many users and forum posts.
Also, the lives of the people who were collaborating on the site don't allow us to dedicate what we would need. Patience.

Thx for your reaction