Have been trying for hours and hours now... it downloads just fine - snappy quick. but when i go to install it - it just won't do it. if i do it through software update i get an error that says it "couldn't expand and was corrupted during download". Have retried probably going on 10x now with no luck. Also downloaded the files directly from Apple - at first got checksum errors, then i turned of disk image verification. It started the install process but immediately gave me an unknown error and said to contact the software manufacturer. I'm not running a developer build or anything, i don't have file vault turned on and have never experienced any issues like this before. any thoughts on this one?