Hi JT
1. There are 1 files. 1 of 2 and 2 of 2. You will need to follow the instructions in the readme file to combine the files into one and then check it to make sure it was combined correctly.
2. You need to perform the upgrade on both nodes. It will not migrate an upgrade from one node to the other.
3. At the end of the upgrade it will ask if you want to make that upgrade active now or later. If now it will reboot the box. If later it will set it to the inactive partition and you can change that later. Check the documentation on this.
4. The upgrade process can take a while. I would guess 60 to 90 minutes for each node probably.
Thanks,
Mike