I have downloaded the files a second time and yes, I am still unable to install it onto my MBA. My OS is 10.8.2...
I have tried downloading it onto my MBP running OS 10.8.2 and yet it still would not install. It says that I should eject the disk image. Sigh.
Download using a browser other than Safari.
Ok, did not thought about that. Using chrome to download the file right now.
Nope, I still cannot open the file. Was thinking of using firefox but then the website does not allow me to download it anymore. Sigh...