I had some strange issues yesterday when installing 2016.04 so I rolled back to 2016.03 to have a few more strange issues (yeah, bad software day - the software fairy must have been at the pub too long).
 
After rollback I found myself having crashes in 2016.03 I had never seen before in some MS****.dll and then realized that 2016.04 must have installed a new C++ Redistributable (14.0.23918) ... so I wonder if 2016.03 was now using libs it was not linked against??? However, my system knowledge is not deep enough to know whether this could really be the case ...
 
I eventually did allow win7 to update (although only outdated about 3 weeks), then did a full VST reset because Sonar had for some unknown reason also reported a lower VST count (@ 1st 2016.04 installation, by 150 or so) and went back to 2016.04 which seems to be OK today (so the software fairy might have had a few aspirins meanwhile)
 
 

In my experience it has not been clean, so I have defaulted to using system restore points. There should have been one created automatically during the .04 installation, but not sure (creating one prior to an installation it a good habit to get into). System restore also operates at a system level and removes most registry entries, which many "uninstall" routines do not do for you.

mettelus
System restore also operates at a system level and removes most registry entries, which many "uninstall" routines do not do for you.

thanks. that's good information. I used the restore points for a while, but basically forgot about them in this rollback friendly environment. I need to go back to really setting restore points before I update ...