Are you using their GML Block or their GML code?
Also is GameMaker: studio priced or not?
Cause If I remember correctly GameMaker is free but GameMaker: studio is pay to use or I'm just dumb and forgot
I use GML code. They just call it 'GameMaker' now because they dropped the 'studio' title recently. They have a subscription model these days, but I bought GMS1 on sale a long time ago and I still use that version, which is unsupported but it has no subscription. Currently they only sell GMS2, with a subscription.