Jira 4.x to 5.x upgrade failed. The installer reports that files are in use and cannot be upgraded. Ignoring the files in use did not result in a usable Jira instance. My test upgrades did not see this issue. Please advise as to what the issue could be.
What operational system are you using?
If there is JIRa running over Windows maybe you installed JIRA as a service so you should stop its service to be able to upgrade your JIRA instance. Also you can check out Running JIRA as a Service document.
Would you please give a try and let me know?
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