It's in our Terms of Service, and vBulletin's website has no free version available for download. They do have a demo, however said demo cannot be downloaded, and is ran closed-source on their servers.
In addition, vBulletin works closely with us to help identify stolen installs and remove them from our service. The only difference in your case is we discovered it prior to them contacting us, but the end result is the same in both cases - the account is permanently suspended, no access permitted, as detailed in sections 6 and 8 of our Terms of Service.
As this is the case, and there is no way around it, I am closing this topic as it is no longer relevant. There is literally nothing that can be done to recover your account at this point.