PeakHour 3 is a brand new app and because of the way Apple (and in particular Mac Appstore) apps are sandboxed, it's not possible to automatically migrate settings across.
If you would like to manually copy your settings over from PeakHour 2, you can do the following:
- Open Terminal.app (type 'Terminal' into Spotlight or click the app in /Applications/Utilities/Terminal.app)
Depending on the version of PeakHour 3 you have, type the following commands:
Version Commands Mac Appstore Direct