Or direct from the site: https://www.torproject.org/download/#android
ADDED: Orfox Bookmark Export option!
After nearly a year since we released the alpha version of Tor Browser on Android, the time for sunsetting Orfox has come.
If you still have Orfox installed on your device, this release will direct you to download the new Tor Browser for Android.
Learn more at: https://blog.torproject.org/orfox-paved-way-tor-browser-android
The Tor Project