Cannot update beyond v14.3 on WIndows 10

First of all, which version of Windows 10 are you running? Newer releases of the Adobe audio and video programs now require Windows 10 1903 (the Spring 2019 update) or later in order to even be installed at all. Your installed build of Windows may be too old (version-wise): It may very well be that you last updated Windows 10 way back in 2018 (automatic or otherwise).

Second, have you updated the main Adobe Creative Cloud desktop app on your Windows system to the latest version? If you are still on an old version of the desktop app, newer versions of any of the Adobe programs may not appear at all until you do update the app itself.