As of today, the Beta page on paratext.org says regarding installing 7.6β4: “If you currently have a Paratext Test Version, you must uninstall it before installing the Beta 4 Test Version.”
I take it that it really is essential to uninstall PT 7.6 beta 2 or 3 before installing 4? Is that usually the case with beta updates that re not PUDs/SPUDs?