Because of irritations about the current “stable” version, here is an update.
What currently is called “stable” is still the outdated version 2.5.22294 from early November 2020, mentioned in my above last posting. However there have been hundreds of (pre-) releases until today’s version (as of writing this:) 2.7.15614.
Be aware that calling “stable” does not mean, that newer versions are “unstable”. On the contrary, those contain a lot of bugfixes and improvements.
I have always recommended to go with a current (pre)-release as long as you don’t need lobby play.
As posted frequently above and elsewhere this is the link …
https://github.com/triplea-game/triplea/releases
… where you can download the latest and hundreds of older versions.
Note: At any time during 2.6 development savegame compatibility broke (between older versions and versions starting from this specific one). Players should use the same (pre-)release version, currently 2.7.xxxxx. Also they should compare their game versions and agree on a specific version before starting a game. However, there is absolutely no reason to go with any outdated 2.6 version.
So either you go with "stable " 2.5.22294 accepting the almost six years old issues - or you agree to go with a current prerelease.