I am trying to download previous purchases on my new Mac Book Pro and it says I need to authorize my computer, how do I do that? Thank You

If the computer's running Mac OS X, move the cursor to the very top of the computer's screen, click on Store, and choose Authorize this Computer.

If the computer's running Windows, press the Alt and S keys and choose Authorize this Computer, or click here, follow the instructions, click on Store in the menu bar, and choose Authorize this Computer.

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