The script got removed due to not being maintained and having bugs. You can try an alternative script at https://github.com/Raven24/diaspora-install
Here's how to get a development environment up and running. This is where any new pod runner should start, as well as anyone looking to contribute to diaspora*.
This script assumes you have a basic Rails setup installed.
Step 1: Run the script and follow the on screen instructions.
Alternatively you can also try an experimental install script (written in Ruby): see here
Step 2: Run the development server
then visit 'http://localhost:3000' in your browser.
Step 3 (for developers): Run tests
Step 4 (for everyone): Party!
Main installation guides
Want a production setup? Having trouble with the installation script? Want to install diaspora* the slow way?
Read the specific installation guides here.