You can download previous drivers from AMD. Go through the menus to get to the latest driver, then on the right side of the screen there is a link to previous drivers. Just select the version you want to download it. Uninstall the Crimson driver, run DDU (Display Driver Uninstaller), then install the version you want and downloaded.
I don't recommend using the disc as that driver was probably very badly outdated shortly after they disc was printed.