There are many accounting/legal reasons you cannot update your OS. Or maybe you have tons of editing plugins you paid for that run on an earlier version of Final Cut Pro.
It’s very frustrating how some sites are no longer supporting your version or browser like Safari, Firefox, Waterfox…etc. Apple refuses to update your Safari. Which they can. Older apps can certainly run in Catalina…they just refuse to do so.
If you need to run wix you can use an Agent Switcher with Safari has one built in and change your agent string. You can run an extension or plugin in Firefox or in Safari preferences turn on the “Show Develop mneu in menu bar”
Once you do that for any browser you can add your user string.
Safari has various other versions or you can add OTHER and your own agenst string.
In Firefox I use
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:78.0) Gecko/20100101 Firefox/81.0
You can find other browser agent strings and keep them up to date.
