Cameron has a 2010 MacBook Pro with OS X 10.5. Can he use High Sierra? Leo says that Cameron should be able to. Frankly, Leo's not impressed with the latest batch of Macs. So using his older MacBook Pro is a good idea. Apple won't let him install it if it doesn't support it. Leo would also recommend getting an SSD to speed up his computer. It's a very easy upgrade and it speeds it up a lot. He can find an SSD for it at MacSales.com.