Removed the drivers using Programs and Features, rebooted, confirmed AMD driver no longer installed, tried again. Appeared to go through all the motions but only installed the AMD Install Manager, AHCI driver, and USB driver -- nothing else. Checked the installation log and only those three items were listed. Rebooted, and no AMD entry in apps list, no AMD item in system tray, Device Manager still showed generic drivers installed.
Retried using the 14.11.2 beta drivers. This time, it went through all the steps and DID actually install the drivers and all the other stuff. Rebooted and AMD is in apps list and in the system tray.
But NOW! I get annoying popups that a newer version of the driver is available -- 14.12!
OK ... web page to the AMD site finally opened and the 14.2 driver there is 212MB, not the 48MB link from the first post in this thread. So, maybe the thread link is bad. I'll download and try this larger version -- and report back.
UPDATE: Downloaded and installed using the 200+MB version of the file -- and it worked fine.