I installed Windows 11 on 10/05/2021 on ACER Aspire 5 A515-44-R2SA laptop, which went well. On 10/06/2021 I installed AMD website download video driver radeon-software-adrenalin-2020-21.10.1-win10-win11-64bit-oct5. After a couple of reboots and everything looking good, I went to Windows Update and it offered Display driver 26.20.14040.0 as an optional update. While that Windows Update driver was installing, I got a message saying there was a problem and the computer immediately rebooted. After the reboot, Device Manager showed driver 26.20.14040.0, but I noticed that it was quite old (3/11/2020). I also got a popup Radeon Software Warning that “the version of AMD Radeon Software you have launched is not compatible with your currently installed graphics driver”. No idea why Windows would offer an old driver. Even when I told Device Manager to try to update that old driver, it said I had the best one installed already.
In Device Manager, I rolled the driver back to the previously installed version which is now 30.0.13025.100 and is probably the driver installed by the AMD download of 2020-21.10.1. Working OK now and I noticed that the Optional Display Driver is no longer listed in Windows Updates.