Please do yourself a favor and read, read again, and read one more time before installing and using this tool. If it's set up correctly, it's very easy to use. But if you don't follow directions, it'll either not work or not do what you expect. Failure to read and follow the directions is NOT a defect of the tool!
o) You MUST be COMPLETELY STOCK to use this tool
o) Did I mention COMPLETELY stock?
o) That means no customizations to the system partition
o) Completely stock does NOT mean having TWRP or CWM or any other non-stock recovery installed
o) Failure to understand these warnings will result in lots of bad things happening
o) Unzip to your C:\ drive <-- THAT DOES NOT MEAN JUST ANYWHERE YOU FEEL LIKE IT. Just sayin'. This means LITERALLY.
o) Optionally install the Universal ADB driver
o) Copy your OTA zip file to the OTA sub-directory in the OTA_Install folder on your C:\ drive
o) Run the RunMe.bat file
o) Select the OTA from the menu
o) Follow the directions!!
The process for getting into stock recovery may be slightly different depending on your phone model/version/etc. You may have to google it up to find out how to enter stock recovery. That is up to you to do.
Once in stock recovery, you'll need to find the option for sideloading the update. Sometimes it's called "apply update from adb". Sometimes it's called sideloading. This is device/version specific, as well, so you may have to search to find out how to get into the sideload mode in your particular stock recovery.
If your device is not recognized by ADB once in sideload mode, you should install the universal ADB driver and that should take care of it.
CAUTION: This is version 1 and hasn't been tested. I'm fairly sure it'll work, but, you know, version 1...