During this trial, you will be reminded DAILY with a popup notification, that now seems to appear wherever it likes on your screen (Not just bottom right) that tells you that your trial is expiring. Upgrading the software will automatically give you a free trial (as far as I am aware, there is no longer a way to opt out of this trial during the installation)
If using Malwarebytes, you will eventually be prompted to upgrade the software Endpoint Detection & Response for Servers