In welcome message on Tor Browser desktop version 13.5.5 that says:
“Tor Browser 13.5 will only receive security updates for a limited time. Please upgrade to Windows 10 or later to receive the latest version of Tor Browser. Learn More”
“Learn more” goes to link:
https://support.torproject.org/tbb/tor-browser-and-legacy-os/
that shows error: 404 Not Found.
it’s being worked on - Update message for legacy OS (windows ≤8.1, macOS ≤10.14) users (#43125) · Issues · The Tor Project / Applications / Tor Browser · GitLab
Thanks for reporting, @ZarkoGjurov.
Yes, it’s being worked on and should be fixed very soon 
(main ticket: Write a support entry on Tor Browser dropping support for legacy operating systems (#373) · Issues · The Tor Project / Web / support · GitLab)
Update: It should be fixed now. Link: Why is Tor Browser dropping support for legacy operating systems? | Tor Project | Support
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