Hearts.of.iron.iv.v1.12.5.incl.all.dlc... - Arquivo:

: Repacks of this size (v1.12.5 with all DLC) are large and require significant CPU power for the late-game "tick" speed.

: This version is heavily defined by the complete overhaul of Italy’s focus tree, new mechanics for peace conferences, and the introduction of the Divisional Designer for planes. Arquivo: Hearts.of.Iron.IV.v1.12.5.Incl.ALL.DLC...

I think the plane designer in 1.12 was a game changer; it finally made the air war feel as customizable as the land war with tanks. : Repacks of this size (v1

With all DLC, the complexity is unmatched. You manage everything from railway gauge widths in Russia to the specific engine type in your CAS planes. new mechanics for peace conferences

The term "Arquivo" (Portuguese for "Archive") suggests this is likely a repackaged or pirated version of the game.