https://community.amd.com/docs/DOC-1313 states: "These graphics products must be installed using display driver version: 8.970.100.9001. This driver is provided as a courtesy and only available via Windows Update.".
But last week this driver disappeared for Windows 10, and was replaced by a newer driver that does not work properly for my HD 4890 card. So now I cannot set a proper resolution (2560x1600) and video acceleration is disabled.
Please post this driver someplace else..? (or repost to Windows Update)
(I was on the Slow Ring of Windows Insider builds. Hoping that the Fast Ring may see updates faster, I switched to it, but driver updates in Windows Update seem to come independent of the current build of Win10. Switching back to a previous installation let me keep my working driver for five minutes before Windows Update promptly replaced it)