We currently have two active codebases. ProEssentials v9 and v8.
Pick your version of interest:
1) ProEssentials v9 : Released on March 24th, 2018. We are working on free additions to v9.
2) ProEssentials v8 : Released on June 24th, 2014. No longer getting new features, and will resolve anything major needing attention.
3) ProEssentials v7 : Released on Feb 20th, 2010. No more changes are expected.
4) ProEssentials v6 : Released on Jan 10th, 2007. No more changes are expected.
5) ProEssentials v5 : Released March 30th, 2003. We updated to resolve Win7 breaking v5 but no more changes are expected.