older versions of adobe dng converter

I can't use the current version of Adobe dng converter for Mac because it's not compatible with my "mature" operating system. However I think that one released last year (v. 10.3) is likely compatible with my OS, and will support my camera. But I can't find anyplace on Adobe's site or elsewhere to download any version other than the latest one. Anybody know where older versions might be found?

A quick google turns up this https://www.adobe.com/downloads/updates.htmlwhich has versions going back to 2005 for the Mac and Windows

Oh dear. That means, that should I ever upgrade my laptop I will also have to deal with LR6 being obsolete... Thanks for the heads up.