The version you have intended has already reached the EOL and no longer supported nor providing the license for it.
So for now, you can explore the later versions on that.
Hope this helps, cheers :)
The problem here is that the recommended upgrade path from 3.x to 4.x is to export the xml and import it into version 4, and to do that, Andrey needs a licence.
If you have a valid licence, you used to be able to swap between the v3 and v4 formats, but I've not had to do that for ages, so I do not know if Atlassian have stopped allowing it. If they have stopped, then you could raise a support call with them - I'm sure they'll be happy to generate a licence for you.
Ok. Have you got a v4 licence for Jira at all?
If you have, can you try logging into your my.atlassian account and see if you have the option to downgrade next to the licence key?
If you don't, then I'm afraid you are going to be pretty stuck - even if you had a licence in the past, you can't upgrade to any version released after the end of it.
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