I bought Minecraft Java edition with a Mojang Account and downloaded the launcher. When I opened the launcher it only gave me the demo version. The payment went through and its still giving me the demo version even though I payed for the entire game. It still gave me the receipt after I payed but the links to download it kept giving me the demo version.
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We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.
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Please check out this help article: https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition-
If that doesn't solve your issue, please contact Mojang Support.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki