If SourceForge is inaccessible, reputable software mirrors also host the 1.2.0 release:
Download Avogadro 1.2.0: A Complete Guide to the Classic Molecular Editor download avogadro 1.2.0
This guide covers everything you need to know about downloading, installing, and using this powerful open-source tool. Why Download Avogadro 1.2.0? If SourceForge is inaccessible