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Even if you have an old key, many users report that legacy activation servers (including the older I understand you're looking for content related to
How to Obtain a License Key for Game Maker 8.1 Pro If you cannot afford the commercial license, the
: There have been reported failures with legacy licensing servers (GM7, 8, and Studio 1.4), which can prevent new activations even for legitimate key holders. GameMaker Community Legality and Terms of Use GameMaker Runtime Licence - Professional