Although infiniminer had a super short development cycle there were still a bunch of different publicly released versions. However, only a couple of these seem to be archived online. The missing versions are significant because the developers were experimenting a lot with the gameplay during development and several features were removed and aren't present in the final version.
There's a list of the versions here: https://theintraclinic.com/archive/infiniminer/
Changelog is here: https://web.archive.org/web/20090511153519/http://www.zachtronicsindustries.com/pivot/entry.php?id=82 http://thesiteformerlyknownas.zachtronicsindustries.com/infiniminer/