If youre having install problems please delete your whole 7 days folder, reinstall 17.1, then copy over the RH files. Switching between versions of Alphas and mods/modlets gets very messy, always start with an empty copy of the vanilla game.
If possible it's best to make a whole copy of the fresh 7 days install and work with that copy and not the default steam location.
Be sure to use the non EAC exe to run the game.