To do the download, you will need programming software. For your scanner, you have a choice of ARC500, Win500, and PSREdit500. Some people have been having problems getting keys for Win500 and the site goes down quite often. There is a question if the author of the software is OK. Each has a free trial period. I use Butel ARC500 and am very satisfied with it. What is your city and county and what in particular would you like to monitor?
St Claire Shores, Macomb Co, Detroit, and Wayne Co are all on the MPSCS statewide system. That system is P25 phase 1, which your scanner is capable of receiving. Here is a link to the statewide system to look at it: https://www.radioreference.com/apps/db/?sid=100