• Ha, dont stress it, it'll download to Apps or downloads. Where are you downloading from? I think your Mac will only go up to Mavericks (maybe). Do you have the App Store? Also, can you go to...

    Settings > Startup Disk

    ...and tell me what you see?

  • Ok, from your description I assumed they had made one partition for your old OS and one for the newer one they installed, but obvs not. Can you screen grab me storage from "About this Mac", just the pretty GUI not the full tech specs you've shown below.

    How do you use each partition? Storage? Movies?

    Get downloading from the App Store (Sierra) and lets get it on your SSD.

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