

That said, you can sometimes get away with playing games on such a system. They mainly exist to appeal to the individual who wants the Mac, but is put off by the pricetag of the higher end systems. Start Steam, let it load, and select a game.

The thing to remember about Apple is that a lot of their cheeper systems such as the Macbook Air and the Mac Mini are designed from the get-go to be stripped down and sactifice power to reduce their cost and size. In the existing games location, remove any games you no longer need installed to make the entire process faster. This is the first time I've heard any feedback from someone specifying they're using a Macbook air though.
CHOOSE INSTAL LOCATION FOR STEAM GAMES ON MAC PRO
I've heard people have success running some fairly high end games on a Macbook Pro before, which is noteably larger and more powerful. I believe your issue comes down to the fact that you're using a model which was specifically designed to sacrifice power in order to gain smallness and portability.
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You could post those exact specs here (click the Apple menu > About this mac) if you wanted to. You described this tradeoff as "potato specs". But there is always a tradeoff for such things. It's built to be minimalistic, small and thin. The Macbook Air is a specialty system designed for portability. Giving steam apps administrative access is entirely unnecessary and actually a bad idea to boot. Your problem however is not with your download location. Steam > Preferences > downloads > Steam Library Folders.
