First and foremost, go to the site "webroot.com/bestbuy" on your system located web browser.
Then, reach to the main page of Webroot and select the antivirus subscription type from the provided option. You have to select between Business and Home editions.
After that, you have to choose your desired product type.
Proceed with the option "Download Now".
Then, wait for the process to finish.
Once the product downloads on the device, a message regarding the downloaded state will be sent to your mail ID.