You should be able to run the official version setup from the LaunchBox\Updates folder. Just install over top and everything should be fine.
This has come up before; unfortunately .NET does not provide a good solution for that. Of course anything is possible, but I would have to reinvent the wheel in order to make it happen, so that's not likely to happen any time soon. There are certainly things that can be done, though, such as trapping all plugin errors and handling them separately, but that by definition won't catch everything.