Manual download of NIS 2010

Hi everyone....

 

I have NIS2009 and would like to manually download the NIS2010 installation file ( NOT the downloader) so that I can have the files on hand as a backup should I need to reinstall. I just cannot seem to find where the manual download is.  There used to be an option in the past to manually download the file.

 

Your help is greatly appreciated.

 

thank you

 

Joe