There are two versions in the archive: Russian and English. You need to install the mod on the version of the game 1.8.1
Briefly about the mod: the main goal is to combine the development branches of all units into one tree. The mod does not break vanilla maps (I personally did not have such problems). I also tried to balance the game, added new units, changed the background for many units added spels and artefacts. To help with orientation in the tree, I created a picture where you can see all units of the game. On it you will see the basic information: attack, health, defense indicators, character bonus, as well as the type of attack of each unit (colored frame around).
P.S. I will be glad to your suggestions for improving the modification.