I too am running into this issue.. get the same error:
This data appears to be from an older version of JIRA. Please upgrade the data and try again. The current version of JIRA is at build number '71011', but the supplied backup file was for build number '100000'.
Hitting next just circles back to same error.
If I go to Atlassian downloads, there is no server version 100000 available (only 7.1.7). Previous cloud version showed 7.2.0, then 100000, and today shows version 100001.
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