Ah, damn, normally you can download the hotfix via the "update available" link at the top, but following that for this one leads to a page that says:

"This hotfix has been discontinued. Instead, you can upgrade to Windows 10 and get the most up-to-date security and other features built right in"

Nice Microsoft, nice.

As for the driver update, you want to download it via the ATI site, rather than through device manager:

The link I provided points you to this page:

http://support.amd.com/en-us/download

And you should be able to download your drivers by selecting the correct version from the product list as shown below. (The auto-detector won't work for your GPU)

...If this doesn't work, you'll need to upgrade to Windows 10. Sorry!