Thanks for responding.
According to my PC I have all of the required updates:
I searched for KB4505903
It is not installed on my machine.
I searched for information on KB4505903
According to this:
It looks like the update should be installed automatically.
I will wait for next AMD Driver release and I will see if the Purple Screen happens again on next install.
If it does I will make some more effort to see if I need to specifically download and install KB4505903
Just installed Adrenalin 2019 19.2.2.
No pink screen when installed but I was running from DisplayPort output from an XFX R9 Fury Double Dissipation this time.
The Adrenalin 19.9.2 driver has a problem understanding Crossfire.
My two Vega 64 cards are in Crossfire but there is no Crossfire button in the GUI to get them out of Crossfire:
I will use DDU again to uninstall Adrenalin 19.9.2. and see what happens during install if I connect the DisplayPort from primary RX Vega 64 Liquid.
This is not a driver bug. The fix for this issue is AMD cleanup utility. Run it before installing new driver. Also disable windows driver updates. AMD cleanup utility is better than DDU (for AMD cards).