You can check the server, by default it extracts itself to c:\swdist. Also check your coworkers workstations for that folder. If you still can't find it then check with your VAR, they tend to keep old copies so they can test in specific versions.
Hi William, typically SolidWorks only stock the latest service packs for older versions.
The best way is to request your VAR, who should either have a media kit they can send you, or supply you with a download link.