update readme

README.md

@@ -58,17 +58,32 @@ opengoal-launcher
 
 1. Launch the launcher and set your install directory
 2. Select a game and let the launcher download the game version binaries
-3. **Run the patch script** to make the downloaded binaries NixOS-compatible:
+3. Patch the downloaded files for NixOS ⚠️
+This is the one NixOS-specific step. The game engine files the launcher just
+downloaded won't run on NixOS out of the box, so we need to patch them.
+
+The `opengoal-patch-bins` script is included with this package — the same
+install that gave you `opengoal-launcher` also gives you this script.
+
+Open a terminal and run:
 
 ```bash
-opengoal-patch-bins /path/to/opengoal/versions/official/vX.Y.Z
+opengoal-patch-bins /path/to/your/install/folder/versions/official/v0.3.1
 ```
 
-For example:
+Replace the path with wherever you told the launcher to install in Step 1, and
+replace `v0.3.1` with whatever version the launcher downloaded. You can find
+the correct version number by looking inside the `versions/official/` folder
+in your install directory.
+
+For example, if you installed to `/home/user/Games/opengoal` it would be:
 ```bash
-opengoal-patch-bins ~/.local/share/opengoal/versions/official/v0.3.1
+opengoal-patch-bins /home/user/Games/opengoal/versions/official/v0.3.1
 ```
 
+You should see `Done: gk`, `Done: extractor`, and `Done: goalc` printed out.
+If you see "already patched" for all three, see the Troubleshooting section.
+
 4. Point the launcher at your PS2 ISO and let it extract, decompile, and compile the game
 5. Click Play