GeneXus 15 Upgrade 5 previews were part of the releasing process of Upgrade 5. They were intended to round up Upgrade 5 and facilitate adoption once released.
Upgrade 5, build 115224, has been released on June 28th 2017.
at GeneXus 15 Upgrade 5.
GeneXus: http://www.genexus.com/developers/RN?,0,,0;4;V15;4;5;;
GXserver: http://www.genexus.com/developers/RN?,0,,0;6;V15;4;5;;
GXflow: http://www.genexus.com/developers/RN?,0,,0;3;V15;4;5;;