Command And Conquer Zero Hour and Direct X

I have had C&C remastered collection for five years, now the Zero Hour program will not load. all of the regular C&C plays fine. But when I try to play Zero Hour,  I get an error message telling me that i need Direct X 8  ( I have direct x 12) and to check to see if I have the correct video card. these games have been playing fine on my system for many years. why wont it work now????