When you purchase SyncTime, you can uninstall SyncTime Lite from the Launchpad or by manually dragging it from the Applications folder to the bin.

The settings created in SyncTime Lite will be used automatically by SyncTime.

Warning: keep in mind that the only limitation of SyncTime Lite is that when the app is closed and opened again, it will start over with empty settings. At that point, it won’t be possible to use the previous settings in SyncTime anymore. If you want to keep the settings created in SyncTime Lite, close SyncTime Lite, uninstall it, and use SyncTime from that moment onward.

If you installed any scripts to be executed when some sync completes, you will have to install them again in SyncTime, since macOS doesn’t allow sharing scripts between apps.