Isolator "Check for updates automatically" appears to not be working on my machine

While running Isolator 8.1.2.1 I never received notification that Isolator 8.1.4.0 had been released despite checkbox "Check for updates automatically" being checked in my Isolator settings. I have seen Isolator new version released notifications in the past.

I double-checked my firewall rules and nothing Typemock-related appears to be being blocked.

I frequently have my network cable disconnected as a productivity technique to make 0 the probability that I will waste time reading Internet news, so perhaps a periodic Typemock update check is being made while I have my network cable disconnected.