After the purchase, try to launch the pre-installed software and search for the option “Activate license”. Depending upon the type of operating system used by the user such as, if windows you will be given a license key through license ID. Search for the option “My license key came through License ID” and enter your license ID over there. If you don’t have a license ID, go for the option that asks you for a license key. If you are a mac user, it may prompt you to enable “real-time protection”. By enabling that permission, you are set to go. The best way to recognize that you have activated the premium account, the logo of Malwarebytes will have “Premium” written next to it.