THX Pman, just want to be sureYou won't lose any settings, it just replaces what it needs to (bit like an update of an app from the play store).
You'll need to download it somewhere that's easy to find (e.g Downloads folder, or SD Card).
Reboot into your recovery > Install > Find the zip file > Swipe to install > Reboot to system (Optional: Can wipe Dalvik/Cache only).
Note: You may need to reflash gaaps along with the zip (for some reason my google play always disappears after an ota but other google apps don't).