Big problem I found right away - it doesn't support a portable non-installed copy of MPC-HC. Without this it won't even let me run the SVP setup wizard (which I'm assuming is what would let me tweak SVP's video settings?). But even then, I'm honestly not really sure why it'd actually need MPC-HC to change any SVP settings...I mean, they're completely separate programs.
Also you may want to make it clear that encoding SVP and/or MadVR videos is not the main purpose of this program - this initially confused me greatly (and I'm even familiar with the program's subject matter!).
EDIT: And only 15 minutes after I downloaded the program installer, the project's page has going missing in action. I haz a confused...
EDIT 2: Unless it's looking for the MPC-HC that comes with SVP? Since I use stand-alone newer versions, I actually deleted the "mpc-hc" folder in the SVP program directory...
EDIT 3: I copied the "MPC-HC" folder from a fresh installation of SVP 3.1.6 (ran inside Sandboxie) into my normal SVP folder and even then the program says "MPC-HC not found".
EDIT 4: I have "Max Download Quality" set to 'Max', so why, for YouTube, is it downloading videos in h.264 format and not in VP9 format? I mean, the video is just going to be re-encoded anyway so we don't really have to worry about VP9 player compatibility...
EDIT 5: Also downloading user videos (not the ones available by default through the program) to the program folder seems a bit odd... I would have expected them to be in either "%userprofile%\Downloads" or even something like "%userprofile%\Documents\Natural Grounding Player"