How do I upgrade from Snow Leopard to Yosemite? Or somewhere in between?

I tried to update from Snow Leopard to Yosemite, I keep getting download error. What steps do I need to make so that it upgrades efficiently? I can not find OS X Lion, OS X Mountain Lion, etc upgrades in Apple Store. This is frustrating as I have a program I want to update and it requires OS X higher than Snow Leopard. I have spent entirely too much time on this issue.

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