Mod «Operation Overhaul» for Hearts of Iron 4 (v1.10.1 - 1.10.4)


Popular mod Operation Overhaul for the game Hearts of Iron 4. It extends the game's technology tree to the 1960 period. The mod follows realism — all technologies really correspond to the development of those years. In addition, Operation Overhaul adds new focuses, ideologies, and a large number of interesting events.

Mod features:

  • New focuses for Czechoslovakia, nationalist and Communist China, Manchukuo, Sweden, and the Russian civil war.
  • The new ideology is monarchism.
  • New weapons that can be produced according to what was actually developed at that time as far back as 1955.
  • Complete reworking of fleet units as far back as 1953.
  • Developing aviation zones for the US and Canada to make them more user-friendly.
  • Many new historical events in the style of "what if".


To work, you need an installed and activated Expert AI mod.

Mod checked on game version: 1.10.1 , 1.10.2 , 1.10.3 , 1.10.4

  • The mod has been updated for the game version 1.10
  • Many different changes

Version 24.09.20 for Hearts of Iron 4 (v1.9.0 - 1.9.3)

Notable Bits:

  • Removed custom France Focus Tree and Political Advisers from France Total Rework, reverting to vanilla
  • Fancy new search tags [i.e. the buttons for 'Industrial', 'Research', etc] in Focus Trees are NOT included for: Czechoslovakia, Japan, Romania, USSR, Russian Revolt (TZR), UK, USA.
    Due the time needed to implement them, no ETA on if/when they will be added for those nations
  • USA and Indian civil wars are likely still broken; we will be investigating these further next
  • Fixed issue with AI building exclusively scout planes


  • Dive Bomber and Torpedo Bomber admiral traits now boost ground/naval attack and naval attack, respectfully, instead of air attack
  • Added 10% urban attack debuff to all armor brigades
  • Mechanized 1 tech now requires Motorized 1 instead of Motorized 2
  • Adjusted equipment requirements for light armored recon and armored recon
  • Willam Halsey Jr. is now a General Staff instead of a Theorist for USA
  • Marc Mitscher added as a Theorist to offset Willam Halsey Jr. change for USA

Many other issues were fixed, including but not limited to:

  • Updated France event/decision/idea/history files for LR
  • Updated Spain event/focus tree/history files for LR
  • Updated Portugal history file for LR
  • Removed France AI strategy files
  • Fixed errors in several AI strategy files
  • Fixed a number of countries having ideology counts that don't sum to 100 at game start
  • Fixed several ideology checks having misspellings of fascist and democratic
  • Fixed various idea related bugs and errors


Version 31.03.20 for Hearts of Iron 4 (v1.9.0 - 1.9.1)


How to install mod?

To install the mod for the game Hearts of Iron 4, unpack the contents of the archive to the folder Documents\Paradox Interactive\Hearts of Iron IV\mod and enable the modification in the launcher.

File info

  • Uploaded by: TOP-Mods
  • Mod author: Lavo
  • File format: ZIP
  • File size: 67.3 mb
  • Source: Go to
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