@gracebee This is what I did:
Navigated to Opera in applications folder
Right-clicked for Show Package Contents
Tossed autoupdate and autoupdate installer.
I hate applications installing software without asking and I hate applications communicating with websites without asking (I use LittleSnitch for the latter).
Ok, so serving the 32-bit offline installer by default is indeed not intentional. Someone is going to look at it. I would guess either server the 64-bit installer or provide both like in the Opera GX section.