Note: Due to Apple's AppStore rules and restrictions, PeakHour 4 cannot automatically import settings from prior versions. These instructions are provided as-is and are not fully regression tested.
The process is slightly different depending on whether you're using the Paddle or Mac Appstore version of PeakHour. See How do I tell which distribution of PeakHour I have? if you're unsure.
Copy and paste the following command into Terminal:
cp ~/Library/Preferences/com.digitician.peakhour.plist ~/Library/Preferences/com.digitician.peakhour4.plist
Copy and paste the following commands into Terminal:
rm -rf ~/Library/Containers/com.digitician.peakhour4 cp -r ~/Library/Containers/com.digitician.peakhour ~/Library/Containers/com.digitician.peakhour4
Once complete, reboot your Mac. This will ensure any old cached preferences are cleared.