Hi Eric
No, just place the AnotherGUI folder in a location that it can write to, i think it does some writing to some preference or preset files and it might fail because it is located in a folder windows wants to protect, eg. "Program Files".
I don't know if it was this that fixed it for me when i had the same error. But placing the AnotherGUI folder on the desktop and FFmpeg folder inside the AnotherGUI folder, and i have no more of these errors. Try that, and see if that fixes it.
You can ofcouse encode files to any folder you set inside AnotherGUI.