I don’t actually know what file he is talking about. There is only one dll there on my system… you could move it somewhere else and see what happens.
OR…try this IF YOU DARE-
launch Cubase without yout MR816 powered on… it should prompt you for some other driver.
Choose whatever.
Shut down Cubase.
Power on your MR816
Re-launch Cubase… it should re-prompt you!
Now you have completed the cipher. Never tell it to ‘remember this audio device’.