When I buy Filemker Pro 12 Advanced, do I have to declare up-front whether or not I want it for Mac or Windows? Or, does the disk come with installable software for both platforms. The reason I ask, is becuase I have two machines of both platform flavors and I would like to run Filemaker on both. I would hope that I would not have to buy 2 copies, although that just may be what I will have to do. Please advise.