Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
Here is the serial !
1 - Download Ccleaner on the official website and install it.
2 - Disconnect your internet connection.
3 - Go in "Options" and "Upgrade
4 - In "Name", enter : Registered User
5 - In "Key", enter : CBB4-FJN4-EPC6-G5P6-QT4C
6 - Activate, reconnect to internet and enjoy !
Hope this is useful