You can choose to use an older version of the App until you are ready to upgrade. Keep in mind you will not have all the newest features and bug fixes of the App.
How to upload an older version of our App
Updating from Server to Data Center
Updating should be seamless once the Data Center version is released. All you will need to do is update to that version,
Any unused previously charged cost of the server App will be applied by Atlassian to the cost of the Data Center license. As Atlassian handles the billing any discrepancies should be brought to their attention but if you are having a challenge we will do our best to help.
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Resolved bugs and released features that you will be missing out on if you downgrade your version.