I have an IMAC and a year ago - had a major crash - had to remove most of the software and start over. I have used Aperature well past the time it was supported and all my photography was stored on an external hard drive after loading the pictures through Aperature. Now that my computer is working ( haven't hooked the external "pictures" hard drive) - Can I open these photos again and or how do I move this large library to a new library system? Any recommendations for a library system. Please help.