Eh, I had a similar problem. I'm low on disk space on C:, but it was able to download the update to C: + E: (E: is a partition on the same drive). Partway throu

Eh, I had a similar problem. I'm low on disk space on C:, but it was able to download the update to C: + E: (E: is a partition on the same drive). Partway through installing the update, it asks me to "insert" disk E, which obviously I can't. Had to roll back the whole update. Now I'm kinda glad I did.