Using Safari 14.1.1, I cannot click on many of the links on the mattermost.org website. For example, I cannot download the latest version of the desktop app from the downloads page using Safari (but had no problem downloading it in Chrome.) (Taken superficially, this seems to be related to the use of target="_blank" for the links in question; I unfortunately do not have the time to investigate this further.)
I would recommend you to download it from the official website of Download the latest version of the Mattermost Server instead.
I am using the same version of Safari and not facing any issues:
Can you please confirm if you are still facing the same issue there?