If you have not yet the EAW Steam, you can get it before the 8 May with a 66% discount.

Probably you will be thinking because I should buy it if I have other versions. I go to give the reasons.
-The 1 september 2017 patch.
-The 1 october 2017 patch.
-The next patch with a lot of fixes (it is under testing and it will be published soon).
-All these patchs will be only for the EAW Steam. Never they will be published for the other versions.
-The amount of limitations from GOG and Gold versions. They can not run a lot of things.
-Multiplayer, the EAW Steam restores the multiplayer.
-My last stuff is only in my EAW Steam mods. The Rebellion mod will be only a EAW Steam mod.
-Most of all the other mods are in Steam, at least the finished and upgraded mods.

All them are good reasons for to build the game in Steam.