Yes, you can use the BAT files provided by other people, just make sure to change the
01a, 01b, and 01c part of it. Yes the BAT files will overwrite the maps you have currently packed in Demo. Even if you overwrite the maps with new ones, you can still play them at other people's servers.
One last note. If you want the maps posted early please include the TXT file, I mentioned above, and one SS of each map. This will really expedite the process. Thank you for your cooperation.