Tests need to consider upgrade paths, not just fresh bundles

[hinerm]

Right now the Gauntlet tests the launcher in a fresh state. This gave false confidence in the success of a release, not accounting for the ways existing installations could be broken.

[ctrueden]

I don't think it's realistic for us to test all the various potential upgrade paths. Possible, yes, but realistic in the face of its complexity and other priorities, no. I suggest closing this issue.