Gamemaker | 8 Decompiler Link
As of this writing, the original YoYo Games forums are gone. Most working links are now hosted on personal blogs like The GMC Revival or GM8 Archive Project. If you type "GameMaker 8 decompiler link" into Google, you will likely see a Reddit thread from 2015. Ignore it.
Instead, join the GameMaker Legacy Discord server. The community has pinned tools, including a modernized decompiler that fixes naming conventions and room loading errors. They also provide virus-free checksums (MD5 hashes) so you can verify your download. gamemaker 8 decompiler link
This is the critical section. GameMaker 8 decompilers exist in a legal gray zone. As of this writing, the original YoYo Games forums are gone
The community consensus: Decompile for learning and recovery, not for piracy. Reimport (Optional): Using an old version of GameMaker 8
GameMaker 8, part of the GameMaker series, is a game development software created by Mark Overmars and later maintained by YoYo Games. It's renowned for its drag-and-drop interface, making game development accessible to people without extensive programming knowledge. The software allows creators to design games for various platforms, including Windows, macOS, iOS, Android, and more.
Once you find a working link, here is the standard workflow:
Note: Decompiled code often looks like if (argument0 > global.var_144) ... . You lose meaningful variable names, but the logic is intact.