After purchasing the Minecraft Java edition from the Minecraft site, I tried to download it by running the launcher.
There are only trial plays, not downloads.
I'd appreciate it if you could fix it as soon as possible.
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This appears to be an account / technical support issue and the bug tracker is unable to help you with this problem. Instead, please read through this article and if that doesn't fix the problem, please contact Mojang Support.

If I log in again, it's the same screen.
https://help.minecraft.net/hc/en-us/articles/360029643892-Can-only-play-Minecraft-demo-Java-Edition- The method written here has not been solved.
Let me know if there's any other way.
If none of the given instructions in the provided article fixes your problem, please contact Mojang Support.

Thank you for your report!
We're tracking this issue in MCL-16570, so this ticket is being resolved and linked as a duplicate.
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