I have the same problem, and I looked on the website for Unity and some people were complaining. They were told to try re-downloading it and if that didn't work try again in a couple of days but they said that didn't work, either. Sorry I couldn't help but I just wanted to tell you that it's not your computer in particular.
Well, you might be able to install "cyndia" on a MacBook Air if there was such a thing. If you mean jailbreaking, there is no point since you can download any software you want on a computer.
If you install windows, then yes
Macbook air
Yes, Pages is a built-in app on Mac computers, including the MacBook Air. You can access and use Pages for creating documents and other writing tasks on your MacBook Air without needing to install it separately.
No, the Macbook Air does not break easily.
Macbook Air.
no it does not have a DVD player it is the only mac book that does not have one
The MacBook Pro cases are much larger and sturdier the the MacBook Air cases.
The camera built into current Macs (including the iMac, the Macbook, the Macbook Air, and the Macbook Pro) is known as the iSight
MacBook Pro is the best you can get
Did you download the Mac version. Regardless here is the correct version>> https://get.adobe.com/flashplayer/Simply download, then double click to install.
For app development for both the design and the coding aspect, the Macbook Air has really nailed it if you do compare Macbook Air with Macbook Pro.