Internal Version, never released
From 3DGE Wiki
Internal Version, Never Released is the designation versions of EDGE were given by Andrew Apted from version 1.16-1.23. They were presumed test versions that never saw the light of day.
On October 26, 2014, Corbin and Andrew Apted released the "lost" versions of EDGE, beginning with 1.22, two releases before 1.24, including source codes, via the EDGE SF website.