Just wondering if anyone knows of an easy tool to auto-install everything like the CEP files, game updates, etc that we need to play, and ideally from a reputable website. A lot of the old links to the CEP or other important game files for multiplayer NWN that I've found by searching don't seem to work anymore

'Official' CEP location

That will work for all modules requiring 2.XX cep's
Backwards compatiable.

If module uses 1.XX cep you need older version
https://neverwintervault.org/project/nwn1/hakpak/cep1-complete

There has been a lot of talk thrown around about CEP 3 shrug.

Vault is the place all modders hang out it is the "official" / "unofficial" place of nwn1 and 2 modding/modules

Really all installers do is copy stuff to right folder which typically is just "hak" folder.

If you have another module that requires say Project Q (another big overhaul) you can just install it and not worry about any conflicts or silly stuff.

Only developers need to worry about conflicts.