Client Custom file must exist missing~
You can use any client for use this files, only need to put Data folder from MAIN_INFO in you Client and just replace.
If you want my custom items i cant share it, because i delete all these from MuServer folder too, this is season 6 files, the screenshots with custom season+ items its for people can see the support of the systems without any problem but not are included in the repack, need to add manually.