Yes I have the same problem and figured out that you have to go to the Microsoft site and go into the downloads, do search of whatever the download is and then just manually download it Usually that's how I do all the Office and Excel and all that.
But I am now having problems with this last one. Security update for Microsoft Office Excel 2007 (KB2345035) and it's 8.5 MB. I can't find the correct download any where and Microsoft keeps directing me to other stuff. So for this one
I am not sure what to tell you, except for any others you can manually download off the Microsoft itself. Hope at least that part helped you. I am trying to still figure out this last security update. It's a ghost.