My Advice, move on and ditch what doesn't work. If the software is so old it wont work with Win 10 its just time to find a new game to play.
Pretty much anything that works with 8.1 (which I personally DESPISE) will work with Win 10. Ive found no exceptions. Win 7 will give you nothing but problems as the machines drivers were made for Win 8.1 and later.
How long ago has it been since you upgraded? Did you do an in place free upgrade?
If its been longer than 30 days you cant just roll back. If its been less and you havent ran disk clean up and the windows.old file is still there you can roll back easily. Im not going to repeat whats been done so here is a link
IF it's not been more than 30 days and IF you haven't deleted the file.http://www.howtogeek.com/220723/how-to-uninstall-windows-10-and-downgrade-to-windows-7-or-8.1/If its been longer your only choice is to either buy a win 8.1 (dont do 7 unless you want
A LOT of driver issues) or contact asus support and beg and plead, especially if you are outside of the warranty window. They will put the original image back on for a fee, there are no recovery disks.
This is why I ALWAYS advocate to buy a new drive when you buy your machine and clone the original to the new drive and put it away the original for safe keeping. If you had done this it would be as simple as putting the original back in, wiping the new one, cloning the original again and you would be back to square one in about 30 minutes or less. That replacement drive costs less than any PITA you will have to endure down the road............JUST LIKE YOUR ISSUE! Saving the original also allows you yo just pop it back in as is should you need to send the machine in for service so you don't have to delete and wipe all your pRon........uh.........sensitive files. I I also advocate to do a full and complete back up of the original image before you do anything else. Install your back up software and make a back up to disk, to the cloud, to a NAS to a JUMP drive but
make a back up!

“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein