Hi, I need to download El Capitan 10.11 down to a MacBook Pro (running Sierra) so I can install it on an external drive. I'm trying to do a fresh external build before cloning over to a 2007 iMac (they max out at 10.11). The iMac is running 10.10 and (a) some newer software baselines at 10.11, (b) Safari 10.1.2 in Yosemite is no longer supported on some sites, and (c) many reports suggest the iMac will run a tad bit faster. Maybe. How can I download the DMG file w/o installing directly on the iMac? Thank you!