Antivirus: updating Trend Micro pain in the neck

Absa customers need to know whether the bank wants us to download the Trend Micro antivirus software or not. I have updated it every year (with a bit of a struggle) but this year I am stuck. Last week I managed with difficulty to find the Absa page with the link and went through the whole process until I reached the point where you put in the new serial number. But an error message informed me that this was the wrong version. There is no indication of which version we are supposed to use but I tried different ones, only to receive the same number each time. In desperation I downloaded the trial version but that will expire soon. Absa, please help! The bank should either support the use of this software properly, or inform customers what else they should be doing to keep their data safe.