How do I access or upgrade to SiteBuilder Plus?

Hi I wish to change to sitebuilder plus so I can edit on my mac ( problem is system is telling me I must have this but no offering a link ) is it possible to have both available as my computer at work isnt a mac ? how do I downlaod it and how do I email you for questions other than using this forum please.

my email alignbodymindsoul@ymail.com