Hello and welcome to JustAnswer, I look forward to assisting you today. Can you tell me please how you are connecting the projector to the computer?
HDMI can be pretty touchy. Do you have more than one HDMI port on the computer, and if so, I would presume you have the different ports?
You may not be able to downgrade but I wish you the best!
You could run into just as many problems not to mention the expense?