

The good news is that Apple still offers Snow Leopard for sale - you can buy it on DVD directly from Apple for $19.99. After all, you need the Mac App Store to do that, and you don't have the Mac App Store on your Mac, because that wasn't introduced until Snow Leopard came out later that year. The bad news is that you can't just arbitrarily jump to Yosemite.
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You didn't tell me how your MacBook Pro was configured, but if it's a 13-inch model, and assuming you fall into the "if it ain't broke" camp, I'm guessing that your 2009-era MacBook Pro came with OS X 10.5 "Leopard," which is an elderly operating system by Apple standards.

And as the old adage goes, if it ain't broke, don't fix it. But the fact is that many of us, like you, use our Macs with the software they came with, because that's what we're accustomed to and that's what we like to use. Some people reading this may be surprised to learn that you're not already running OS X Yosemite, after all, it should work just fine on a 2009-era Mac. Unfortunately, there's nothing you can do under those circumstances except get your Mac working with more modern software. That error message is legitimate: Some web sites will block you from their content if they judge you to be a security risk or if the browser you're working with is too old to support the technology they are dependent on.
