Delphi 2005 TPngImage or Equivalent?

Question

I see from this discussion, and the Nick Hodges blog, that the TPngImage has been rolled into Delphi. That's great and all, but we've got a project that's stuck in D2005 and we need to do a simple conversion from PNG to BMP. Is there anywhere that we can get the legitimate source for this? I do not want to run afoul of Embarcadero's licensing, but I DO want to pave the way for a smooth transition to DelphiXE2 (or 3, or 9, who knows when we'll actually convert?). Suggestions? Thanks.