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I am trying to install Firefox offline. I know you use to be able to do this but I don’t it is possible anymore. I am on windows 10 and every time I try to install it just throws this error (see attachment). And when I reconnect Wi-Fi or Ethernet the installer works.

This last upgrade on Aug 1st has completely screwed up my browser. My zoom is now insane, requiring shrinks that ruin boxes and other web objects. Half of my menu is gone. Never seen a worse browser disaster. How do I reverse this upgrade? Thanks for your time.