Large Scale Central

Help needed with zipped files in MS Train Simulator update

Having trouble with zipped files for Train Simulator. Ive downloaded them and unzipped them to a non MSTS file. im not sure what to do with them next. Ive unzipped them to a non msts folder cause unzipping to a msts folder causes an error. can anyone help who has done the update? i got the update from MS. its the 1.2 update.