Problem upgrading NIS 2008

I have NIS 2008 on an XP and a Vista machine.  I'm trying to go through the upgrade center to upgrade my valid NIS 2008 to NIS 2010.  When I get to the Norton Download Manager and select "Start Download" I get a windows communication error.  This is on both the XP and Vista machines using IE 8.0.  I also tried this using Firefox with the same problem.  My internet connection is otherwise fine.

 

So, I can't download the NISDownloader.exe file.

 

Is there a workaround?  Can I just remove NIS 2008 with a Norton Removal Tool and download NIS 2010 (assuming I can find a link somewhere) and install it and use my NIS 2008 product key to activate it?

 

Any help would be appreciated.