Apologies here, I havent been entirely clear. Thanks for the replies so far, learning new stuff is always good, and sounds like vCenter would be the way to go, and 60 days free would be plenty to do the task with encryption of data during transfer.
However at the moment I am just using Converter Standalone, no other software. I am not using vCenter and it is not needed to do the task, but wondered if it also features any encryption.