Previous versions of zoom

I don't have the answer for you, unfortunately. However, they will be forcing upgrades by the end of May. Check out the notification for zoom v5 and the new encryption standards. FYI

Be careful of 3rd party download sites. It's popular to alter the zoom installer to introduce malware, at least on the Windows side.

Zoom is going to require 5x and cut off older clients.

https://www.androidauthority.com/zoom-update-may-30-1123689/