Hi, I have a Samsung Captivate from AT&T. I recently downloaded a .apk file on my SD card hoping that I could run it on my phone. Unfortunately, when I try to run/install the file from my Captivate, it says "Install Blocked for security reasons". After researching I saw that I could easily fix this problem by doing Setting>Applications>Unknown Sources. Except I have one big problem. The Unknown Sources setting is not on my phone. Please help finding a way to install the .apk apps onto my Captivate from another source besides the Android Market. 
Additional Information: I have a MAC so any outside application also have to work on MAC.
THANKS SO MUCH IN ADVANCE!

Additional Information: I have a MAC so any outside application also have to work on MAC.
THANKS SO MUCH IN ADVANCE!