Before using any decompiler, make sure you understand the risks and potential consequences. Additionally, if you're a game developer, consider reaching out to the game engine creators or official communities for support and guidance.
If you are a developer concerned about your own GM8 games being decompiled, the community has offered historical solutions. The most well-known was (not compatible with GM8) and score_under's anti-decompiler tool . While specific tools are hard to find today, the concept remains the same: use obfuscation tools to scramble your compiled code in a way that makes it difficult for a decompiler to parse correctly. gamemaker 8 decompiler link