The site needs a simple method of downloading archived versions of the software. I would think most people are reluctant to make regular changes to their production server. I have myself been as far back as 3 revisions of the openfire/wildfire server. Luckily I download the releases as they come out so I have them. Even more lucky is I now have a sandbox server to test on. I have seen many requests in the forums for older versions of the software (Openfire and Spark). It would be a great service to your customers to provide a consolidated download site for these.
After much requesting by various people, I put together a list. Please see Previous Openfire Versions. Note: I have not checked all these URLs. I just know that many of the old versions are still there and a consistant file nameing scheme has been used over the years. Good luck!