ive got it as well and so does another guy i know so you're def not alone

both me and my friend have the same issue, disabling this mod solved it.

Yes its hannend me as well.

seems you need to use this mod AND his unit mod or it wont work

same problem here, the game would crash when I pressed End Turn or clicked a settlement. Disabled the mod and it seems to work fine.

Got the same problem

the same problem -.-
I starting new campaigns or selecting towns after loading a saved campaign crashes

Use both mods. That fixes it. Read the Change logs

Radious [author] 20 Aug @ 3:43pm
Demon3321: As is written in requirements and changelog Sir - you need both radious mods on! Then game wil work fine unless you have some conflciting mod/mod remain in data folder.

Yep same here.
Having to use the units mod as well is sort of ♥♥♥♥ tbh.
I enjoy radious' changes to the game in the campaign sense as it makes the game just a lot more interesting, but the units he adds to the game are just too many for me and a lot of them lorebreaking, sure I like using them for custom battles and all that stuff but in campaign it's just too many.

Like sam I really don't want the extra units. Ill just keep my save on hold and start a new campaign with no mods right from the start while I hope/wait for this to be fixed

This part of mod doesn`t update(total war mod) . Help to fix, pls?

Wait, so If I just want Radious mod without the units then I won't be able to play the mod unless I have the unit mod turned on? Wow. I mean, I enjoy the Radious mod, but I do not wish to use the unit mod as it adds too much for my liking. Can they maybe fix it? Or am I forced to use a mod I do not want to?

They recently changed it so that mod units are part of garrisons now which is probably why it crashes when you click on towns now without the unit pack. It's probably possible for them to change this so that the changes to the garrisons are part of the unit pack instead of mod but it really depends on whether they feel like going through that additional effort. I don't really mind the new units though there may be too many (also worry that some of them may change the balance of the game by patching ability gaps in roster lists that were intentional)

Both mods are required, its written in the changelogs, mod description and mod requirements. If you will follow that, all will work nicely.