My understanding is that as long as you don't ever need to add new music, movies, or tv files to your library, or try to look up new/better metadata (the tags like album artist,album, song title, etc.), MC28 will run as usual and sound the same as it always did. Any new files or requests for updates to them would not have access to the servers so you'd have to manually enter all the metadata. My understanding is that access to any online/streaming music like Cloudplay would be similarly unaccessible if the "connection" to it was on JRiver servers. For me, these functionalities could justify the upgrade even if the myriad fixed/new functionalities added since MC28 don't apply to your use case.