The new OS from Mac is here in OS X El Capitan. Apple's 12th OS release is the OS X El Capitan.Named after a rock formation in the Yosemite National Park, USA, OS X El Capitan continues and focuses on stability, performance and security in which OS X Yosemite started. IMovie for iOS and iMovie for macOS are designed to work together. You can start cutting a project on your iPhone, then use AirDrop or iCloud Drive to wirelessly transfer it to your iPad. You can also send a project from your iPhone or iPad to your Mac for finishing touches like color correction and animated maps.
no problem...okay, let me try to help you out here. Basically once you have installed El Capitan, or Yosemite or even Sierra, you cannot go back to your old OS without erasing your hard drive. that being said, what you could do is get your iLife dvd's and put 'em in your dvd drive. The installers should show up and you can install them from there. I don't think El Capitan came with a whole bunch of apps, though. If trying to install the older versions doesn't work, you can get iMovie on the App store and I think GarageBand as well for $28 for the two of them,. iPhoto has been replaced with Photos and is built into the OS, so it's free, as far as I know. you used to be able to get something called Pacifist which would let you install just the things you wanted to from the Snow Leopard dvd (which I'm assuming you're using here)
El Capitan Update 10.11.6
--could also be under purchases in the App store if linked to your previous Apple ID
El Capitan Update Download
El Capitan 10.11.6 Update Problems
hope this helps a bit
John B