Hello :)
Thank you for your purchase <3
Don't worry about the Windows tag, after downloading and unzipping the .zip file, inside it, you will get the .json file and the assets' folder, you simply open GDevelop on your Mac then load the .json file, and everything should work perfectly :3
Then you can publish to Android or IOS or to any platform you want inside gdevelop 👍
Keep in mind, the template supports PC only currently, but you can modify the events to support touch as well 😉