I may not quite understand what you are trying to do, so forgive me if there's a misunderstanding.
When installing any new version of the game, you have to let the files extract into their own folder separate from any previous versions of the game. For example, after extraction, there should be a folder that's called "Harem_Hotel-v0.9.2-pc" and another called "Harem_Hotel-v0.10-pc" (other platforms may have something other than "pc" in the name) unless you deleted the first folder, of course.
All of your previous saves should still be stored in a separate folder (as I indicated in a previous post), so the new version should see those saves automatically. One problem you may have with any saves from a previous version would be if you had used the Walkthrough mod with those. Until that mod has been updated (should be soon), it can't be used with the new version and there's not a lot that can be done with your old saves until then.
Please let me know if that helps at all.