Hi,
You should be able to upgrade by following these steps: https://spjsblog.com/commentbox-for-sharepoint/installation-manual-v3/#Updating_from_an_older_version
The extra list for storing the subscriptions will be added automatically.
I forgot to mention that the old subscriptions will no longer work. You could find all items in the comments list sufficed with “:subscription” and move those to the new subscription list created by cBox, but the format of the items in this list is a bit different. Try subscribing to one thread to see the format you must replicate.
Alexander
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This reply was modified 6 years, 2 months ago by Alexander Bautz. Reason: Added info about subscriptions