This driver is for the first released v1.x versions of the TP-LINK TL-WN722N model. You can use this driver if there is no version number on the back label under the barcode or if there are numbers such as v1, v1.10.
Download the driver by clicking here (the download will start after waiting a few seconds on the page that opens) and after plugging the wireless adapter into your computer, run the setup.exe installation file in the ZIP file you downloaded. Once the installation is complete, your Wifi adapter will be usable.