Hi
Since The Alaska-Hawaii installer didn't automatically add the Scenery Library entry (you did it manually), the uninstaller doesn't automatically remove the Scenery Library entries (you have to do it manually). Go to Scenery Library and delete those entries for the old Alaska and Hawaii.
Since you installed Alaska-Hawaii Base Terrain, then added the Scenery Library entries manually, the proper uninstall procedure would be to to first remove the Scenery Library entries, then uninstall your previous verison of Alaska-Hawaii. This will prevent the scenery.cfg errors.
Hope this helps
Thanks
JT\FSG