You just got the āI donāt understand your repro stepsā icon -> 
I am equally confused by your shorthand.
You should not need internet access after youāve downloaded the installer and moved it to your music pc, just to run the install anyway. (my understanding)
You were able to successfully download the installer and get it to your music PC without any errors right?
So then, the actual error message is on your music PC after you start the install, right?
It was able to extract itself, right?
It would be odd that the installer would error out on lack of internet, not saying itās not possible, cuz I donāt know everything it does.
Are you sure itās the installer and not the eLicensor thatās showing the errorā¦or maybe itās a Windows error message?
Iām not on my music computer at the moment, so canāt check to see how the installer is set upā¦have forgotten, but sometimes there is an exe and an msi portion of the installer. If you tried setup.exe for instance, maybe try cubase.msi instead, or visa versa. Wild-a$$ guess, stab in the dark, but maybe worth a try.