Have you tried downloading and installing the driver directly ?
If I download the 17.1.1 driver directly, it installs and extracts it into my AMD folder, then opens the AMD-software, but the AMD-software tells me that I can upgrade from my current driver (16.50.2011) to the 16.50.2611 driver.
EDIT: I Just noticed that the driver (16.50.2611) that I can install, when I download the 17.1.1 package IS the 17.1.1 driver. I installed the 16.50.2611 driver and rebooted my system, then the control center told me, that the 17.1.1 driver has been, and is currently installed.
AMD hello? you ok?