Save the .exe or .zip file to your USB drive.

You are not alone. In fact, internal diagnostic data from major PC manufacturers suggests that "accidental driver deletion" is the #3 cause of home internet connectivity loss, trailing only router outages and ISP downtime.

Since you can’t connect to the internet, you need a second device (a friend’s PC, a phone, or a public library computer) and a USB flash drive. Here is the sequence most people skip.