Hello Peter,
I've been using advanced module manager for all my Joomla 3 websites for maybe more than a decade.
This is the first time I tried to use it on a Joomla 4 website.
After the installation, I get an error 500 when I try to access the modules in the backend.
Also all of the modules appear on all of the pages after that.

I searched your forum for solutions and followed the steps below:
I tried completely removing all regular labs extensions and re-installing them.
I tried to erase /libraries/regularlabs & /plugins/system/regularlabs and re-installing them.
I tried updating Joomla and most components (I have 2 that cannot get updated at this time).
I checked the antivirus in my server to make sure that it doesn't automatically delete any of the installed files.

Unfortunately, I couldn't solve the issue. Would you mind taking a look?
I'm including login information below

Sorry for that... I left it on the last step and haven't hit save.
Please try again 🙂

It worked 🙂
Thank you Peter.
Do I have to recreate all the module assignments after installing the advanced module manager?
Because still, all the modules appear on all the pages.

This website was built in Joomla 4 from scratch.
I had configured the modules correctly but there was a need for advanced module manager to create some more specific arrangements.
When I installed it, the positions were messed up.
I could do them all from the beginning with advanced module manager but I would rather skip that if there is an easier way and focus on the development.

I just saw that although the main module page is correct now, when I get into any module I get an error 500.
Sorry for not noticing that earlier.

Many conditions were created but all of the rules are empty...

Error during the installation:

Unexpected token '<', "
"... is not valid JSON

It seems to have been installed and the error 500 is gone.
The module positions were not generated though.
Should I uninstall everything and try installing it to see what it does?

I uninstalled and re-installed but the conditions were not transferred.

Peter don't worry about it.
I started arranging them manually to make sure I have them ready on time!
Thank you for your precious help so far 🙂