So the public beta opened up today so I though I'd give it a try! However for about an hour or so, my 2014 macbook air has been attempting to install 10.11 (I asssume the public beta is b3). The file downloaded just fine, however, the install process has yet to complete. The bar stopped moving at around 90% at which point it said it had 10 minutes left. Now there isn't a time on the screen and has just been sitting for about 45-60 minutes.
Is this normal and if so, should I let it sit for another hour? What are my options?