Hello !
On GOG, some point & click game like "Grim Fandango" "Monkey Island" "Broken Sword" are on Windows but now I have a MAC OS and I cant play with them.
Do you have any solution or any website for ddl or buy this game ?
Thank you for your help.

Grim Fandango is available for Windows, Mac and Linux. The default option is Windows. In order to download the Mac installer, select "Mac" in the System menu (see attached picture).

(Monkey Island on GOG is indeed Windows only. I don't have Broken Sword).

Note, however, that if you are using MacOS Catalina, 32-bit games such as Grim Fandango won't work (Catalina only supports 64-bit software).

Nice, thank for your answer !