Your solution works great to revert the Link to Windows phone-app to an earlier version and keep it that way.
But the problem everyone is having is with updated versions of the Phone Link app *on the Windows side*.
The updated versions of Phone Link on the Windows side require the user to physically unlock the phone before Phone Link will connect to the phone. Earlier versions of Phone Link allow the user to use the PC keyboard to unlock their phone -- which means the user doesn't need the phone to be nearby to use the PC to access the phone.