AMD only supported OpenCL 1.0 for HD 38xx and 48xx GUs and has since dropped even the 1.0 support. So, you will definately need the older drivers and that probably means the older SDK if the OpenCL.dll isn't included in the drivers.
Now, AMD supports HD 5xxx or newer GPUs.

Good luck on the OpenCL since DA implemented OpenCL 1.1 as the default plan class in BOINC. So, unless the project admin changed it, even if they don't use OpenCL 1.1 enhancements, it still won't send your GPU any work even if you do get BOINC to recognize it. Also, since the 4600 is only single precision, your choices of projects are limited even more. Donate and Collatz should work. Not sure if any others will.