Step by step here my friend:
1.download BLT file online(some maps requires super BLT so yea be aware of that)
2. Download berdlip(or that’s what it called...? Idk, forgot the file name, but it’s close)
3. (Optional) launch PD2 and check if the mods are running. If it is, the bottom left of the main page will show what mods you have installed)
4. You can now start installing mods or custom maps, and put them into the “mods” folder
(if you don’t get one, i think you could create one on your own in the data file of the PD2, or i think one of the files in step1-2 will download that too, i forgot exactly)
p.s. some maps only works when being put in the file “maps” instead of the file “mods”
i am sorry if any of the information is wrong??