Have a look at this video which provides simple guide on Tor download and setup.
Visit https://www.torproject.org/ and simply download TOR browser by following the procedure.
1. Download TOR file, and save it
2. Then double click on it.
3. Click ""Run"" then choose the installer's language and click OK (2).
4. Make sure you have at least 80MB of free disk space in the location you select. If you want to leave the bundle on the computer, saving it to the Desktop is a good choice. If you want to move it to a different computer or limit the traces you leave behind, save it to a USB disk.
5. Install and Wait until the installer finishes. "