1) Go and buy a copy of AHD.
2) install it over your copy of V2.
3) Patch it to 2.31
4) Download APD 3.2.9
5) Delete any existing PDM folder inside the Victoria 2\Mod folder before installing.
6) Extract the zip to your Victoria 2\Mod folder-- all of it, including the .mod file.
7) Fire up the launcher, select 'A POP Divided' from the bottom-left menu, and press 'play'. The Checksum generated may not match that above first time you play, but should on subsequent launches.