All HD Series GPU cards are now considered to be Legacy and not supported by AMD driver updates.

This link will give the last AMD Drivers for the HD77xx/M series GPU card. They are all the same driver for all the HD7700/M series GPU Cards: https://www.amd.com/en/support/graphics/amd-radeon-hd/amd-radeon-hd-7000-series/amd-radeon-hd-7730