Where to get old Blackberry Desktop Software Versions?

Hi,

A user of mine uses a fairly new Blackberry but our firm uses a very old version of Lotus Notes (v5). We were using Blackberry Desktop Software version 4.2.2 to manually sync calendar and contacts. Everything was fine until the program recently became corrupt and needs to be reinstalled but we do not have the install file any more. Unfortunately, Blackberry.com does not have 4.2.2 available anymore (only 4.5 and later, which will not work with our version of Notes).

Does anyone know where one might be able to still get version 4.2.2 of the Blackberry Desktop Software? I've been Googling for hours but only coming up with dead links or viruses :(