Well, sometimes it is difficult to express myself correctly, sorry for that.
My old Link version is belonging to the Pro-pack
My new Link version just purchased as a single stand-alone plugin. The license key is invalid for the old Pro-pack version of Link.
As I understand I have to delet the Pro-pack Link plugin and install the new stand-alone Link plugin and apply the license key for that version. Should be no problem – unless the existing Links between user and Connection will be broken.
The links should be persistent, does that mean that a delete and reinstall with the new Link version will keep the links?