Whonix no longer comes with the tor browser, you have to download it. And, when you try (no matter what version), it gives you a timeout error.
One solution I’m trying is to manually edit the timeout with:
kdesudo kwrite /usr/bin/update-torbrowser
then search for curl_download_max_time= and increase the timeout (in seconds). This threw me, the timeout is a couple of lines up. It defaults to 180. Change that to 3600. Hopefully, this will work.