WD 4TB Passport - Can't use Paragon NTFS for Mac because I run Mavericks! Help :(

Hi, I just bought a new WD 4TB passport to use with my Macbook Pro 2013, running on Mavericks due to my older music production software.

The Paragon software that is supplied doesn’t work for older MAC os, apparently I need Paragon NTFS for Mac 14 and not version 15.

Can WD supply me with this software so I don’t have to buy it? And am I right in thinking that it is better to have NTFS with Paragon than to reformat my WD Passport to exFAT? My main concern is security, I want my drive to be password protected/encrypted. Thank you.