There's a device you can buy quite cheaply from DEI (DEI 530t) that will convert two windows to auto-up/down. Buy two of them and you can do 4 windows (you'll just leave the 4th set of wires unused, since the driver's already has it. (
https://www.amazon.com (commissions earned))
It splices into the window button wiring. Quite easy if you're handy.
I've had one on my convertible for a few years and works perfectly, with no issues. Even has anti-pinch functions included. Lots of how-to's for diff cars here:
https://www.google.com/search?q=DEI+auto+up+down+window