Update CONTRIBUTING.md

Author: juraj-hrivnak

CONTRIBUTING.md

@@ -3,6 +3,7 @@
 ## Required software
 
 - [Git]
+- [Pakku]
 
 ## Recommended software
 
@@ -34,24 +35,14 @@ You can do that using **terminal**, **cmd** or the **GitHub Desktop** app.
 
 ### 5
 
-- Run the set-up script:
-    - If you are on _Windows 10 or higher_, run the `./pax/setup-windows.ps1` with _PowerShell_.
-    - If you are on _Linux_, open your _terminal_ and use the `cd` command to move into the `./pax` folder, then run `sh setup-linux.sh`.
-    - If you are on _macOS_, open your _terminal_ and use the `cd` command to move into the `./pax` folder, then run `brew install grep` and after it is finished, run `sh setup-macos.sh`.
-
-### 6 
-
-- Open your _terminal_ and run the [ModpackDownloader]:
+- Open your _terminal_ and run:
     ```
-    java -jar ModpackDownloader-<version>.jar modpack ..
+    pakku fetch
     ```
-    > **Note**
-    > Make sure to replace the `<version>` with the correct version of ModpackDownloader.
-
-
 
 <!-- Links: -->
 [MultiMC]: https://multimc.org/
 [Visual Studio Code]: https://code.visualstudio.com/
 [Git]: https://git-scm.com/
+[Pakku]: https://github.com/juraj-hrivnak/Pakku
 [ModpackDownloader]: https://github.com/Joshyx/ModpackDownloader