You should run setup first. That creates a fresh database or uses an existing empty one).
Then if you want to import an existing database, empty the (not delete) the newly created one before you import the old one. You can still do that now if you want.
It sounds like you either tried to import the old data over the top of the newly created one or imported the old one before you ran setup. Either would create the error you describe.
So no reason for you to wait, as the new version will not change this.