Scan, ARC250 doesn't support the BC246; as he already has a premium sub, the only thing left is to determine exactly what area(s) he's trying to program, where he is and precisely what software he's using (the UASD doesn't support downloads via the RR web service, and he says he *thinks* he has ARC246).
Oscrette, even with the download, you are going to need to understand how to work with the DMA memory scheme. We have a FAQ (and there is an online manual) that should be helpful to you. Go to the blue toolbar under the Scanner Master ad, and float your mouse over Wiki and select FAQs. Select the Uniden DMA FAQ from the list. At the bottom of the page are the links for the Easier to Read online manuals. Select the one for the 246 and download it.
I would also post in your state's forum; perhaps someone has a file you can use, as was suggested earlier. Another thing I would do - people will ask about this - is where you are. Go to the User CP (which is in the blue toolbar under the thread title) and enter your location data (county/state is fine) under Your Profile and Edit Your Details.
73 Mike