Open your Terminal and enter the following line. When it asks you to install XCode CommandLine Tools, say yes.
bash <(curl -fsSL https://raw.githubusercontent.com/Darmstaedter/MakeMyMacAwesome/master/install.sh)
Updating is easy. Just enter the following:
bash <(curl -fsSL https://raw.githubusercontent.com/Darmstaedter/MakeMyMacAwesome/master/update.sh)