Download and unzip GM-S MC from the link below.
Double click on GameMaker Studio Master Collection 1.4.1567 [Activated].exe and install it.
After installation finishes, close it.
Go to C:Users[User Name]AppDataRoamingGameMaker_Studio
Use Startilla_V3.exe to open GameMaker-Studio Master Collection. If you have Steam and double click on GameMaker-Studio.exe, it will open a list of games you have subscribed to to play on Steam.
You’re done! Enjoy!! :)