But you can't. At least I couldn't on my iMac. This article tells you to choose only one option at a time and that was the solution for me.
Doesn't seem logical but it worked.
The support software download is massive and takes a long time. I set my machine to never put hard drive to sleep and I went to bed. In the morning the software was downloaded and iMac was asking for a disc to burn it to.
Hope this helps some of you get past this annoying glitch.