The one download that opens every Osiris node.
Every Osiris node is a Tor hidden service, and a hidden service only opens in Tor Browser. Install it correctly once and most of the ways a first connection goes wrong are closed before you start.
The only place to get Tor Browser is the Tor Project website. Any other download is either an unverifiable mirror or a modified build. If a page is not the official project, close it.
The Tor Project signs every build. Verifying that signature against the project key on the first install is the difference between a clean browser and one that leaks around Tor. The download page documents the check for every system.
Open the shield beside the address bar and set the security level to Safest, which turns scripting off everywhere. Osiris works at Safest, so you lose nothing you need. Do not add extensions and do not resize the window, because both make your fingerprint unique.
