Infrastructure Software

We are wanting to download Solaris 10 (actually wanting update 7 since that's what our client has, but can't find it).

We found the "download" site for sol-10-u10-ga2-sparc-dvd.iso, but when we downloaded it, we were unable to get it to boot from the iso. The error we got was "Operating System not found".

What else needs to be done to the iso to make it bootable. I had thought -- incorrectly it would appear -- that an iso is bootable...