Saving on 1v91 and pairing on 1v92 with windows 10

Got it I think. You're doing:

function btnPressed() {
  kb.tap(kb.KEY["c"], 0);
}

but c doesn't exist - it's C that you want:

function btnPressed() {
  kb.tap(kb.KEY["C"], 0);
}

There is no concept of upper of lower case keys - just a letter itself, and then whether you apply the SHIFT modifier itself. Confusingly C is actually lowercase c though - I didn't think that through :)

If you upload the modified code then it might start working? Failing that, please could you try using the HID example unmodified, direct from the website in case there's something I missed?