Update README.md

README.md

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 Transfers Spotify playlists to Google Play Music. It is an addition to Playify.
 
 ## Setup
-Download the [latest release](https://github.com/krmax44/playify-transfer/releases/latest) and unzip it. Firstly, open `password.exe` and set a password. **Without setting a password, the Transfer app will not start.** You will need the password later. Then open `playify-transfer.exe`.
+### Windows (pre-built)
+Download the [latest release (standalone version)](https://github.com/krmax44/playify-transfer/releases/latest) and unzip it. Firstly, open `password.exe` and set a password. **Without setting a password, the Transfer app will not start.** You will need the password later. Then open `playify-transfer.exe`.
 
 Now open a playlist link. You can take [this one](https://open.spotify.com/user/spotifycharts/playlist/37i9dQZEVXbMDoHDwVN2tF) for testing. Click on the red transfer icon in the bottom right corner to begin the transfer progress.
 
 Transfer needs to run everytime you need to transfer a playlist. If you wish it runs always by default, right-click `playify-transfer-invisible.exe` and select "Create shortcut". Press <kbd>Win + R</kbd>, type in `shell:startup` and press enter. A explorer window will open. Now copy the created shortcut into this folder, double click it and it will always be running.
 
+### Linux, Mac OS and Windows
+Windows users should prefer the pre-built way of installing. You can use this if you already have Python installed.
+
+[Download Python 3](https://www.python.org/downloads/). Once downloaded and installed, download the [latest release (source code)](https://github.com/krmax44/playify-transfer/releases/latest) and unzip it. Open a terminal in the folder where the files are located and enter:
+```
+$ pip install gmusicapi
+$ pip install websocket_server
+$ python password.py
+```
+
+Now set a password.
+
+```
+$ python playify-transfer.py
+```
+
+Transfer should now be running and you can start moving playlists in Playify.
+
+**This setup needs only to be done once.** When using Transfer again, just type `python playify-transfer.py`.
+
 ## API documentation
 
 All commands are sent in JSON format via WebSocket to `ws://localhost:5673`.