Unzip the Annex WI-Fi Basic package to a folder of your choice.
Connect your ESP device to your computer serial Com Port.
Run AnnexToolKit.exe from the unzipped parent folder.
Select the appropriate Module Type, Com Port, and Speed (Baud Rate).
If your ESP device is not capable of 'Auto-flash' then start it into flashing mode manually (gpio0 to 0v at bootup).
Click the yellow 'Flash Firmware + Data' button if doing a first-time flash, then follow the screen prompts.
After successful completion, the device will reboot and run the new firmware.
Connect wifi to the ESP SSID that will appear in the computers list of available Wifi SSIDs (takes a few seconds).
Browse to 192.168.4.1 to open the default Output window, then right-click the Editor button to open it in a new tab.
Enjoy