the latest version is 1.011? becaues iv seen posts about stuff like .50 and .51
The original game is currently at version 1.191
Entrenchment is currently at version 1.051
Diplomacy is current at version 1.011
So yes, if you're running Diplomacy then 1.011 is the most recent version. It corresponds to version 1.051 for Entrenchment and 1.191 for the original game. Generally people use the original game's numeration, since the other ones can be ambiguous.