Slipa666, I've tried every combo of install per my instructions using the latest files which the links on my post will get you and I can't duplicate your errors. You shouldn't need to do anything except what's in the instructions on the edited original post. You should not copy any files from "IMPORTANT - READ THIS BEFORE INSTALLING" b/c those are just copied from the original Aric's Mod and have already been applied and also altered in their final location to fit in with the rest of my changes. You don't need to (nor should you) apply any mods in-game using the mod panel (they're already activated on the version I've uploaded). My best guess is this is an install error and some of the files are getting mixed up.
In case something went wrong before, I suggest you try a 100% fresh install (maybe backup all of your previous installs to a separate .zip or something to be sure they are out of the way?). Literally all you should do is copy 2 folders - the main game (S4PGameFolderRMAM097) folder can go just about anywhere as long as you have read/write enabled there. The AricsExpansion folder needs to go where it would normally (which I assume you have figured out else I expect you'd have bigger problems, but see instructions again if needed). Make sure you are using the Strive.exe from the latest S4PGameFolderRMAM097 too (not from a previous install or shortcut thereto) which you should download from the mega link in the original post (I did update it to fix some errors as noted).
Once you have those 2 folders copied over and working, then you could try applying my optional tweaks and/or other mods. I hope that helps, otherwise I'm at a loss. I really hope it works out for you. Best of luck!