Old software can have unpatched vulnerabilities.
For modern, secure, and professional development, it is recommended to move toward modern GameMaker, which offers a free version and a more powerful, updated workflow. license key for game maker 81 pro link
Game Maker 8.1 Pro is a legacy product that has been officially discontinued and is no longer available for purchase from YoYo Games. GameMaker Community License Key Status and Availability Official Purchase Old software can have unpatched vulnerabilities
The current version of is a complete, feature-rich game development environment available for free . YoYo Games has shifted to a model where the core software is free, which includes full access to the integrated development environment (IDE) and export options for Windows, macOS, Ubuntu, HTML5, Android, and iOS. You can create, test, and even upload your games to the GX.games platform without paying a cent. The only time a fee is required is for a one-time $99.99 payment for a commercial license if you plan to sell your games. The only time a fee is required is for a one-time $99
If you are getting started with game development, strongly consider using the current, actively supported version of the engine. You can download the latest version for free directly on the official GameMaker Website . The modern version no longer relies on those ancient license keys and offers vastly superior tools and performance.