Origins Mac unable to use as I have OS 10.5.8

I purchase a few expansions with the recent sale and chose to download, but after realized that my mac cannot use the origins installer as I have the os x 10.5.8, not 10.6 or higher.  I tried to download it to my work pc and then took the folder and put it on my mac, but cannot get it to install (high end loft and ambitions).  Two questions, is there a way to get origins to work on my mac or is there a way to install the content from the folder I downloaded to my work pc, put on my jump drive and then onto my mac?  Or is there a way to get EA to answer any of my questions regarding my order and just send me a disk?  Thanks!