(1). Interesting Purple Screen appears during install after DDU removal of 19.8.2 - main topic of this post. (2). Incremental update from clean DDU install of 19.8.2 fails to install correctly. (3). Download of 19.9.1 and clean install over clean DDU install of 19.8.2 fails to install correctly. (4). Windows 10 is STILL AUTOMATICALLY INSTALLING VERY OLD "WINDOWS AMD DRIVERS" from <= year 2017 for Vega 64/56 and other GCN cards if you do not completely disconnect from the internet after removing AMD GPU Drivers. (5). Adrenalin 2019 19.9.1 installer is completely blind to "WINDOWS AMD DRIVERS" mentioned in (4) above and installs over them without removing them first, breaking AMD own installation instructions.
Radeon Software Version - 19.9.1 Radeon Software Edition - Adrenalin 2019 Graphics Chipset - Radeon RX Vega High Bandwidth Cache Size - 8176 MB High Bandwidth Cache Type - HBM2 Core Clock - 1750 MHz Windows Version - Windows 10 (64 bit) System Memory - 64 GB CPU Type - AMD Ryzen 7 2700X Eight-Core Processor
Screenshots of the Purple install caught on my Samsung G7 - Pity I could not use AMD Link to report these issues directly from my phone...