Hearts of Iron IV is a war strategy game. It is developed and published by Paradox Interactive. It is the sequel to Hearts of Iron III and part of the Hearts of Iron series of grand strategy games focusing on World War II. It released on June 6, 2016, on the 72nd anniversary of the Normandy landings. Here in the Hearts of Iron IV Errors guide we have collected some errors and their fixes. But before you go through the fixes, check the system requirements given below.

Also if you want complete immersion check out Black Ice, it crashes too much for me but it has so much thought and effort put into it, and it's amazing (when it works). Millennium Dawn is pretty good if you want a modern day mod, and Old World Blues is set in the Fallout universe which is pretty nifty. To install the mod for the game Hearts of Iron 4, unpack the contents of the archive to the folder DocumentsParadox InteractiveHearts of Iron IVmod and enable.

Hearts of Iron IV System Requirements

Minimum:

OS: Windows 7 64-bit or newer
Processor: Intel Core 2 Quad Q9400 @ 2.66 GHz / AMD Athlon II X4 650 @ 3.20 GHz
Memory: 4 GB RAM
Graphics: ATI Radeon HD 5850 or NVIDIA GeForce GTX470 with 1GB VRAM
DirectX: Version 9.0c
Storage: 2 GB available space
Sound Card: Direct X- compatible soundcard

Recommended:

OS: Windows 7 64-bit or newer
Processor: Intel Core i5 750 @ 2.66 GHz / AMD Phenom II X4 955 @ 3.20 GHz
Memory: 4 GB RAM
Graphics: ATI Radeon HD 6950 or NVIDIA GeForce GTX570 with 2GB VRAM
DirectX: Version 9.0c
Storage: 2 GB available space
Sound Card: Direct X- compatible soundcard.

How to Fix Hearts of Iron IV Errors: Crash, FPS Issue, APPCRASH, Flickering and More

1. Random Crash Fix in Hearts of Iron IV:

Update the drivers.
- To check whether the drivers are up to date or not, follow the steps below:
  - Open Command prompt.
  - Type Driverquery.
  - Then click Enter.
  - In the result, date of last update of the drivers will be available. Make sure that these dates are not more than six month from the current date. If it is, then update the drivers.

2. FPS drop and Lag Issue Fix in Hearts of Iron IV:

Updating the drivers will fix the issue in most cases.
If you don’t see any improvement, open Task manager and set the game to high priority.

3. Screen Tearing issue during gameplay Fix:

Turn on Triple buffering with V-sync. This will resolve the issue.

4. Hearts of Iron IV Green Flickering issue Fix:

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Disable the crossfire is you have enabled it. That should be enough to fix it.

5. Hearts of Iron IV APPCRASH Issue Fix:

Playing Hearts of Iron IV in compatibility mode will be fixing it. So change the Hearts of Iron IV compatibility to Windows Service Pack 1.
Then restart the game.

6. Hearts of Iron IV Game download stopped at 99% Issue Fix:

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Click on cancel. You will get the download success message.
If that does not work, restart Steam and try.

This guide is for people who would like some of the mechanics of the new MD merger update explained or have some basic tips for starting out, it will be expanded over time.

The Merge and new Features

Modern Day 4 and Millenium Dawn have decided to merge their mods into one, the new mod mostly uses the MD4 Map and Units while retaining some MD focus tree among other things.

Newly added features since the merge are: Eagle pcb download.

Taxes, Money and debt
Investing into nations via building
Influencing Nations
24 Ideologies for the 5 Outlooks and many Leader Portraits for these ideologies
2000 start date (based off of MD4)
New Generic Focus Tree and some new Focus trees
Party Coalitions and Government Popularity
Land Doctrines and a few new Techs
Many new decisions

Economy (Money and International Investment)

One of the new features is an Economy System, you have a Daily Income, Daily Expenditures and Debt

Taxes
You can change the Tax Rate ingame via clicking on the + or – under your Leader Portrait, each click costs 50 PP and changes the tax rate by 1%. Changing the Tax Rate will be your main source of Income but be careful not to increase it too much as that will lower your Ruling Party popularity.

Resource Exports
Haven’t really figured out how this works exactly but you gain a bit of money from having resources

International Investments
You can open the Investment window by left clicking a foreign state (puppets and Allies work aswell). After clicking you should see a small window above the State window, there you can select which building you want to build, how many you want to build and can see how much time it will take and how much it will cost. After Investing the project will pop up as a decision timer showing you when its done among other infos. Investing gives you International Investment Points (refered to as IV form now on), you gain as many as you spent in the construction. You can sell off 1 IV point to gain 0.95 Cash if you really need it. You can also just gather as many IV points as possible and gain a daily income boost from it

Government Expenditure Laws
You can Find these under your Political Window in Laws, each Grant you some bonus while costing Money or sometimes even other things, you can reduce these by changing the law at the cost of PP, doing this will reduce your daily expenditure but also lower your Ruling Party Popularity. Unfortunately the tooltip won’t tell you how much you’d gain by changing the law.

Economy Growth Rate
You can find this under your Political Window in Laws, the better it is the more Tax income you get, it also increases Stability slightly and increases Construction Speed although you’ll have to pay a bunch of cash to change it, even if it gets changed via event.

Debt
You gain debt by going below 0 in your treasury, this mostly happens if you have a negative daily income or changed your Economy Growth Rate. You can also get a loan by left clicking, and pay off debt by right clicking the debt resource on the right of air experience. You have a minimum of a 0.5% Interest Rate which means you pay 0.5% of your debt as expenditure each day although if your debt is very low you don’t pay any at all.

Starter Tips:
to be added

Some Formulas:

Taxes + International Investments + Resource Exports = Income
Government Expenditure Laws + Interest on Debt = Expenditure
10 (10 Cash) International Investment Points = 0.001 Daily Cash
1 International Investment Point sold off = 0.95 Cash
Income – Expenditure = Increase or decrease in Treasury
Debt x Interest Rate = Daily Debt Interest Expenditure

Influence

Another new feature is Influence, similar to Victoria 2, each nation can Influence each other Nation. You open the Influence Window by right clicking a nation. Influence can be gained by clicking the buttons in the influence window, and used for economic gain, changing their party popularity or even puppeting a nation

How to gain Influence

Spread Influence, Costs 100 PP and gives you 4-16 power depending on your Power Status (national Spirit)
Give Economic Aid, costs money depending on the targets nation Economy
Target Other Influence, Costs 100 PP and reduces Influence of another Influencer by 10 and additionally of another by 1%, also reduces your Influence by 1%, you can target the second highest influencers (excluding you) and the Independence from foreign Influence Level of the nation.

What to use Influence For

Manipulate Politics, Costs 10% Influence and increases their party popularity for your outlook aswell as ideology by 5%
Attempt coup, costs 200 PP, has 3 outcomes based on different Factors, Succesful Coup (Change Ideol

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