Can't Install Nvidia Drivers

I downloaded the latest drivers from here: https://www.nvidia.com/Download/driv...x/162107/en-us but can't seem to install them; it says it can't install while X is running. But I don't know how to turn X off and still run programs! I tried Ctrl+Alt+F2 to switch to just the command line, but it gave the same error.

Dell Vostro 5590 i7
Linux Mint 18.3 with MATE Desktop