Yeah, Tew4 does not allow other mods, because there are few chances anything is compatible with. If you want "rename towns" mod to work with TEw 4, go in Tew4/data/s/load only these scripts.txt, open it then add at the end of the list:

rename.erm

Save, activate both mods and it will work. You must do same thing if you want "upgrade all", or "heroes improved interface", or "morn battle fields" to work with TEW4, must add their erm ID to TEW list.

Also, if you activate mod then reload an old save, you must press F12 to refresh scripts, or will not work.