Head over to https://github.com/ata4/bspsrc/releases/latest and grab the release for your platform (usually "bspsrc-windows.zip")
Extract it somewhere and run the `bspsrc.bat` file if you are on Windows
In the `Files` tab, you can drag and drop your bsp file (the map you want to decompile)
Once the map is in there, head over to the "Other" tab (if you don't see it, press the down arrow in the top right)
Once in there, select "Extract embedded files"
Click "Decompile" in the bottom left.
It will ask you where you want to save the output, you can save it anywhere.
Once it is finished, go inside the folder it generated and move the content of each sub folder to their corresponding folders in the cstrike folder of your source game (if the map is bhop_monster_jam, you'll get a folder named bhop_monster_jam_d. Inside it, there will be other folders, for example the "materials" folder's contents will need to go in C:\path\to\steam\css\cstrike\materials)
Make sure everything is in the right place (if it asks for things to overwrite, just say yes (source textures are often reused across maps)
#### Important note: the map bsp file will need to be under cstrike/maps and not cstrike/downloads/maps
Once this is done, you may use [Source2Roblox (tutorial)](https://git.tommyy.dev/Source2Roblox/tutorials/src/branch/main/Source2Roblox.md) to decompile the map
