Of course, why not ? If you can only find the previous version somewhere ...
Well yes, I do have the 2.8.98.0 drivers saved,,, I save all my drivers I use to "make" the computer... doesn't everyone? heh
But,
even if I didn't,
there's a button
(Device Manager > Sound, video and games > right click on RME Fireface 800 > properties > Driver tab)
called "Roll Back Driver"
I don't think I've ever used it for anything, but I think it would allow you to roll back to the previous driver used, windows must save somewhere, without having the old one in a file saved like some nerd might do.