Default [Q] Restore using a Mac?

I had my LG rooted with TWRP installed. Then the OTA came and is making my device go into an endless loop. I cannot even enter the download mode- it just goes into TWRP. Windows does not load drivers anymore- tried 3-4 different packages, G2 shows up in Device Manager but with the exclamation mark for no drivers and ADB doesn't show any devices.

Using my Mac, I can connect to ADB. I tried pushing the PA ROM and the file transfers but when I try to install, i just get a failed message.

Can anyone possibly help?