The compression method from version 1.x is no longer available, although version 2.0 can still decompress version 1.x's files. I may drop support for decompressing Huffyuv 1.x files in the future. The Huffman tables used for compression are now stored in the AVI file along with the compressed data. This is an important change because it means I can distribute improved Huffman tables in the future without breaking backward compatibility. It also makes it easier for end users to play around with custom Huffman tables.
Decompression is still a lot slower than compression, though.
The assembly language code has been moved to its own ASM file, so you'll now need MASM or a clone in order to compile Huffyuv. Jon Kirwan has a page explaining how to get MASM for free . That damned RGB compression bug is finally truly fixed. RGBA compression can now be enabled in any application. Don't enable it unless you plan to use it.