Laughing Man: Try "getmaps <dbfile> [options]"
The help is wrong in this case... sorry! (normally it doesn't matter where you place the options but it seems it does in this script)
Uh, sorry, i think i misunderstood you. you cannot convert an "old" (non sqlite) database from mapper. an sqlite-database has the ending.sqlite not .db.
My husband made a python-skript for me (see attachment) for downloading google street maps into a sqlite3-db. Works fine. You need Python 2.x und PySQLite 2.x...