I have upgraded my raspian on a raspberry pi3 using the following instructions
Option 3: Modify your own image
If you want to use your own wheezy installation, you must make the following changes yourself to the Raspberry Pi.
You can download and run our install script. This will automatically download and install all the packages and dependencies required for GoPiGo to your existing Raspbian image.
1). Open the Terminal on your Raspberry Pi and clone the Dexter Industries GoPiGo Repository.
git clone https://github.com/DexterInd/GoPiGo.git
2). A folder named GoPiGo should appear in you current working directory.
3). Open it and go to Setup Files directory:
4). The install script is called install.sh . Make it executable
sudo chmod +x install.sh
5). Run the script
6). Follow the onscreen instructions and the script will install all the dependencies and will Restart upon completion. Your Raspbian should now be ready to run GoPiGo.
How do I access the Dexter desktop