First users Open official website i.e. webroot.com/safe.
User select the Webroot antivirus according to their preference like whether they want to buy.
After the user select the product, then they should make the payment of their product.
Then they have to download the file.
Then download process complete.
After downloading, they have to open the .exe file.
Then enter the 20 digit key code.
product key will be there in the registered email ID.
Next user enter the product key.
Then the user have to click on the Agree and Install button.
Now, press "Yes " in the dialogue box which displays on the computer screen.
Then webroot will start scanning the device of the user.
User have to wait till the scanning process complete.