The Mac App Store needs to support software demos and upgrades
Longtime Mac users remember how software was distributed before the introduction of the Mac App Store five years ago. You could buy boxed software in retail stores, and you could download shareware that you could try out and pay for if you liked. There was also freeware that developers gave away. Some developers still practice the shareware model, but the Mac App Store has become the sole provider for much of the software people use on their Macs. This has its advantages: users are protected, since Apple validates the software; they don’t have to trust their credit card numbers to potentially dodgy websites; and it’s easy to redownload apps and get updates, all through a single app that serves as a storefront. Developers pay Apple a 30 percent commission, but Apple…