I have an older MacBook Pro that has my Aperature library with referenced originals on an external hard drive. My goal is to keep the referenced originals on the external drive but to connect it to my late 2015 iMac. I've already downloaded Aperature onto the iMac, but that is it. I don't need Aperature on the old MacBook Pro anymore, and I don't want to move anything else over from MacBook Pro. Any ideas?