note: your_url is your git hub url get it from the github Copy the clone command (either the SSH format or the HTTPS)
git clone your_url
You can do this with the --branch flag, which will also accept a tag.
$ git clone [email protected]:mygitname/theproject.git --branch 1.0.2
In most cases, you will just want to checkout the tag as described in Exprator's answer.