Getting old Notes/Domino versions for developing purposes

I’m developing software for Lotus Notes/Domino using both LotusScript and C++ Extensions. I need to test/debug my software on older versions of Notes/Domino but can’t seem to find any dowload link for trial versions of these.

What I’m specifically is looking for is Notes/Domino 6.0 → 6.5.4. Anyone knows where there is a page with different versions, for developers to use?

Best regards, Peter

Subject: Using old bugs is always fun ;op