[Qmail-scanner-general]upgrade from 1.16 to 1.20

[Jordi Marine]

Hi,   I was trying to add a second antivirus to my qmail-scanner 1.16 reconfiguring the qmail-scanner-queue.pl, but didnt work, i supose i have to reinstall qmail-scanner , so i decide to upgrade to the latest version ( 1.20 )   Which is the easiest way to upgrade the qmail-scanner??