Daniel Hirst writes in JRA-11598:

"Also when there is an error starting up Jira because of incorrect data, the screen displays the message

Please install JIRA Enterprise, or downgrade your Enterprise data to Standard.

and the downgrade link links to an erroneous page in the docs because it does not yet exist."

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I (Rosie) have now added the Enterprise-to-Standard documentation, so could you please correct the link inside JIRA to point to the following new page:
http://www.atlassian.com/software/jira/docs/latest/enterprise_to_standard.html