You make a donation by clicking on the Donate button here:
http://neuron2.net/dgvc1decnv/dgvc1decnv.html
Then I give you a license that you use to unlock the software.
I can assure you it will decode and frame serve VC1 properly as long as you have a supported Nvidia graphics card. See the table linked at the site mentioned above.
Whether you can make it work with MEGUI is another matter. I cannot make it work with MEGUI with recent builds but others have no problem. So I don't know what the answer to that is at this time. But you can always serve the video to x264.exe manually via CLI without using a GUI.