If I was downgrading I definitely expect to have to use the clean up utility as i did when going back from 26.5.1 back to 26.3.1 ( due to the older driver install package not knowing what was going to change in the later driver) - but upgrading to a newer package , that shouldn't be happening as the later driver installer should be configured to be able to be installed without having to have to mess about as it should know what is being changed