Check Your existing Main firmware version:
=> Turn on Your unit, push & hold "Display", press "Standby", release buttons
=> To see additional firmware infos (DSPs etc) press button underneath "Tone" repeatedly ( don't wait to long)
Onkyo / Integra have told us, that these updates should not be installed if Your current firmware to start with for 905 / 8.8 is below 1.05 or 875 / 9.8 / 885 is below 1.04 (same seems to hold true for the 805/7.8).
Many users have used these updates on older firmware versions too without any problems.
If You got an earlier version to start with, there might be additional steps to be taken (DSP:hardware modification + HDMI+NET:additional firmware) !
If this is the case, and You need them, contact Your nearest Onkyo / Integra service point for the complete update procedure.
I told You so...