1Use the official site
Download Tor Browser only from torproject.org. Search ads and file-sharing sites sometimes offer modified copies.
2Check the signature if you can
The Tor Project publishes signatures for each download. Verifying one confirms the file was not altered.
3Install and connect
Open the browser and press Connect. The first connection can take a minute.
4Let it update
Tor Browser updates itself. Accept updates promptly before opening the Tor Watch onion.