HI @Kelvin Chan,
It should be compatible, if it's throwing an error during upgrade it could be something else. I'd suggest logging a ticket with our support team at www.support.atlassian.com, they'll be able to help you troubleshoot the upgrade.
Finally I can get the JIRA 7 with Core installed successfully. However, when I apply our existing JIRA license key into the JIRA Core, I have got the following error:
The license could not be installed.
This license is not for the selected product. Please make sure that the license is for the selected product and contact Support if the issue continues.
Can you please advise what to do next?
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