I was wondering if I can use live update 6 with my MSI Aegis 3 desktop. I know there is a advisory note that says no 'AIO PC' but I was wondering if this was meant to include the Aegis 3?
That includes Aegis. It is also part of All in One family (ie prebuilt, custom PC).
Anyway, utilities and drivers dedicated for your PC are on MSI's product site:
https://www.msi.com/Desktop/support/Aegis-3#down-driver&Win10%2064