I dont think it's on his end.. I'm having a similar issue.. SOME mods are installing.. others are not. The updated minimap mod isnt working at all.. the angle mod.. not loading and a few others I cant remember off the top of my head.. Others are loading fine.. Didnt have any issues 2 versions before the current one(didnt use the one before) I've removed the modpack completely and redownloaded everything.. Still, only some of the mods will load up.