Today I saw an update to Multiplex that I bought as part of the MacUpdate Promo bundle. I went into it, did the update (it uses Sparkle) and found that it was no longer registered. I went back to the original download link and downloaded the new version all registered. It looks like the developers embedded the license info in the Resources directory of the app bundle; so when it gets updated using Sparkle, the license gets wiped out. Wow, brilliant. Stop being clever and just have a reg file or a reg code; it is easier to maintain and it won’t do stupid things like this (yes, if you move it to another machine you have to copy the reg info, but that’s a minor price to pay).