Installation problems

I downloaded the Yosemite beta without any problems, but after I clicked install, the install failed and the computer shut down. Every time I try to reboot, I get a black screen and it shuts down. I have now reinstalled 10.9.4 and I'm now downloading Yosemite again.

Has anyone experienced the same issue?

After the download finishes, where can I find the Yosemite install file. I case the installation fails, I don't want to download again.

I have a 2.5GHz 17" 2011 Macbook Pro with a 1TB SSD with 3 partitions.