Hi Chris
Pain, pain, pain LOL
E.g.; Wow these things are still out there - amazing 
Unfortunately, no way for me to help out. Version 5 is close to 20 years ago(!). Most likely why sales cannot help too. We've been through like 4 takeovers in those years and things just get archived / lost / deleted... Even if we would find it somewhere, I doubt it would work on any OS newer than Win 3.1 (maybe XP, maybe...). E.g.; according to this: Windows XP - Wikipedia, the free encyclopedia , WIN XP released in August 2001. Version 5 of CR released in 1997(?).
I suspect your best option is to not even touch the app. Don't fix what ain't broke . And if you do need to modify anything, go with VS .NET and the CR SDK for that. (or CR for Eclipse - Java SDK). Yeah, that will mean recreating the app from scratch...
- Ludek