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The short answer is no. YoYo Games no longer sells licenses for GameMaker 8.1 Pro. The software has been replaced by the modern GameMaker (formerly GameMaker Studio 2).
You're looking for information on a license key for GameMaker Studio 8.1 Pro. Here's what I found: license key for game maker 81 pro link
Official support for this version concluded shortly after its removal from the store. Current Availability:
Do you have an you are trying to open? What type of game are you trying to build? I can recommend the exact tools or modern
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If you are trying to recover old .gm81 project files, specialized software preservation communities and forums dedicated to retro game development often maintain archived, DRM-free copies of older software variants that are modified purely to bypass the dead activation servers. When exploring these archives, always use caution and scan all downloaded executables through reputable security tools. Why You Should Migrate to Modern GameMaker The software has been replaced by the modern
Intrusive browser extensions that disrupt your system performance. Why Developers Still Look for GameMaker 8.1
If you are running a legitimate archive version of GameMaker 8.1 and it prompts you for an activation code, you can bypass the deactivated online check using a generic hardware string. The Offline Serial Bypasses
The original activation servers (such as Softwrap) have experienced significant downtime or permanent shifts, making even some legitimate keys difficult to re-validate on modern hardware. Modern Compatibility: