The current version of ApplicationXtender is v7.1, which is a Service Pack on the v7.0 release.
Stay Current with Your System
All versions before v6.5 SP2 are end of life, and v6.5 SP2 becomes end of life soon:
ApplicationXtender v6.5 SP2 ends primary support life on June 30, 2015
Extended Support Year 1 (Same level of Support) available through June 30, 2016
Extended Support Year 2 (Best Effort only) available through June 30, 2017