Hotfix’size is up to 63.2MB, including the CCC and driver.

4800 driver is open source this time, and this hotfix’s official page notes that the driver hasn’t been full tested by AMD . It’s possible that it’s a third-party driver. When we setup the hotfix, WHQL showed up as well.
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ATI today releases a hotfix for HD 4800series. This Hotfix improves overall performance and stability. The Hotfix includes the Display Driver and Catalyst Control Center. The hotfix supports:
- Radeon™ HD 4870 series
- Radeon™ HD 4850 series
To download the Hotfix Driver, please click on the links below:
Official Page
Radeon™ HD 4800 Series Hotfix for Windows XP (32-bit and 64-bit included)
Radeon™ HD 4800 Series Hotfix for Windows Vista (32-bit and 64-bit included)