Have you reinstalled the BSG launcher aswell? Also try removing the user folder from SPT see if it'll work
No it is not about this.I know this problem's solution but i dont know how to help.This dude needs a folder that named install_EFT.You have to put this folder in C: drive in the open and open the register.bat with admin rights.But i dont remember where did i found this folder.I will try to upload to a site as last option.