Thx bayo,
With your tips, i have get the source code !
This is my method:
1) Clone the repository:
$ git clone <repository name>
2) Check if you are in master branch:
$ git branch
3) List all tag:
$ git tag -l
4) Get the stable version:
$ git checkout <stable tag>
5) Create the stable branch:
$ git checkout -b <branch stable name>
6) Check if you are in stable branch:
$ git branch