AptX is a codec that allows for high quality audio streaming. In order to install it on Windows 10, you will need to download the aptX codec from the official website. Once you have downloaded the codec, you will need to unzip it and copy the files to the "C:\\Program Files\\aptX" folder. After the files have been copied, you will need to restart your computer. Once your computer has restarted, you will be able to use the aptX codec with your audio streaming applications.