Hi! I have updated Audacity 2.1.3 -> 2.2.0 on two pc's and both times the old version didn't get removed. Updating through Patch My Pc resulted in a situation where I had two versions of Audacity installed.
Unfortunately it's Audacity installer problem that it doesn't replace or remove the old version, we can't do anything about it for now.
Similar story here a few months later, except it looks like v2.1.3 has been removed. A complete system search can only find one Audacity executable. Patch My PC still lists both v2.1.3 (red) and v2.2.2 (green) in the list on the right hand side of the Apps window.
Incidentally, I'm seeing both old and new versions of Adobe Shockwave Player and Jave SE Development Kit.