Hello,
I bought minecraft in 2016/2017 and now when I want to load any version from 1.0 to 1.17.1 it tells me that I am in demo version ... I would like to understand why since I bought minecraft 4 years ago 😞
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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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Duplicate of MCL-16570, which was later resolved as invalid because this is an account issue and the bug tracker is unable to help you. Please see the Mojang Studios note attached to the parent ticket to potentially fix this issue.