To manua gle900_wi lly download the software for your 11ac Dual-Band Wi-Fi Dongle 900, click on the link for your operating system. Choose Run to install the software or Save to save and then run it later.
When you run the installer your screen will dim and you will be asked to confirm that you want to run the installation. This is normal.
Note that if you're using a company laptop, you might need administrator rights to be able to install the software.