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Why an outdated Tor Browser makes Torzon links less safe
The browser is the one piece of the chain you fully control.
Security fixes
Tor Browser is based on Firefox ESR and receives the same security patches. Old versions keep known holes open.
Onion improvements
Features such as onion proof-of-work and better circuit handling arrive in updates. Old versions miss them.
Update from the source
Use the built-in updater or the official Tor Project download page, never a bundle linked from a forum post.
Check after updating
After a major update, confirm your security level and bookmarks are still set the way you expect before opening a torzon link.
Open Torzon links only in an up-to-date Tor Browser from the official source.