How to update anti virus even if not genuine

This all depends on the amount or RAM that your system has so as to support some of these anti virus systems like Kaspersky, BitDefender and the likes which require plenty of RAM. All the same, some of these anti virus softwares will provide trial one-month (30 days) period where you have access to full updates. Decide on the anti virus of your choice and search through google. Purchasing some of these anti virus softwares nowadays are at a reduced price but the only limitation is that most of them are limited to a one-year to three-year period. Purchasing a new anti virus is always the recommended way to safeguard you computer hence the safety of your personal information/data. Regards