Hey there, so I have added this to my current career game, which has a few mods in it, including contract configurator, and there doesn't seem to be any accept for decline buttons for me. I am using the latest release of the mod, and tried to reload the game. I will next try to do a clean install of the mod too, as I installed contrats window as well, which seems to share the same mod folders and though they are different mods, I assume they don't override each other's mod files accept for core CC files. Otherwise if it still doesn't work, I presume its conflicting with another mod of mine, which for me i'm running fairly stock save for a few quality of life improvements in the game.
EDIT: And so I deleted the mod folder, installed only mission control on the go, and still the accept and decline buttons are not showing.
EDIT2: And as if by some miracle, the buttons have appeared. Note that I installed this mod first then reinstalled contracts window as well. Not sure if by installing them in order fixed this by such, though it seems to be fine now. Phew, needed a mod like this thanks!
EDIT3: AAAAND it only worked in the KSC not the VAB. I don't have access to the buttons in the VAB.