Setting a Password on My Passport for MAC

I came across this old thread:

http://community.wd.com/t5/External-Drives-for-Mac/Password-protection-for-My-Passport-for-mac/td-p/569818

It provides a link to a place where I can supposedly download some software which will enable me to setup a password, at:

http://support.wdc.com/product/download.asp?groupid=219&sid=158&lang=en

I think it should be ‘WD Security for Mac’? But this is greyed out…there doesn’t appear to be a link? Does anyone know if this is still possible? 

Also, the drive I would like to set a password on already has files on it, so I want to be sure that adding security after files are already there is not going to cause them to be wiped or anything?

Many thanks

Hi there, welcome to the community.

Can you please share the Model number of your drive to point you in the right direction.