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Hearts of Iron IV
By Blood Alone icon.png By Blood Alone
No Step Back icon.png No Step Back
Battle for the Bosporus icon.png Battle for the Bosporus
La Resistance icon.png La Résistance
Man the Guns icon.png Man the Guns
Waking the Tiger icon.png Waking the Tiger
Death or Dishonor icon.png Death or Dishonor
Together for Victory icon.png Together for Victory
HoI4 icon.png Base version

Patches and hotfixes are free updates for Hearts of Iron IV, though they are different in purpose:

  • Patches fix bugs and/or implement balance tweaks. They are sometimes released alongside a new, major DLC. When this occurs, a portion of the DLC's features are usually shipped as part of the coinciding free patch, thus made available to anyone who has the base game.
  • Hotfixes are very small updates to the game that usually fix only a few bugs and may contain a few changes to the gameplay as well. Hotfixes are commonly released shortly after major patches to fix any unforeseen bugs that came with the previous update, or independently to fix newly-discovered bugs or exploits.

Note that newer DLCs cannot be activated if you are playing on an older patch version. This is also applicable to mods, which have various levels of compatibility with new patches.

Version history

Version Date of Addition Checksum Notes
1.12.8 16 Jan 2023 9d51 Patch, aka "War Effort: Operation Capital"
1.12.7 08 Dec 2022 b738 Patch, aka "War Effort: Operation Source"
1.12.6 24 Nov 2022 a6ba Patch, aka "War Effort: Operation Tungsten"
1.12.5 03 Nov 2022 18aa Hotfix
1.12.4 18 Oct 2022 cb16 Hotfix
1.12.3 06 Oct 2022 6b16 Hotfix
1.12.2 30 Sep 2022 e45c Hotfix
1.12 27 Sep 2022 45c2 Major patch (aka "Avalanche"). Released alongside By Blood Alone
1.11.13 23 Aug 2022 d173 Hotfix
1.11.12 09 Jun 2022 22d5 Hotfix
1.11.11 12 May 2022 8e75 Hotfix
1.11.10 07 Apr 2022 09ac Hotfix
1.11.9 10 Mar 2022 3f99 Hotfix
1.11.8 25 Feb 2022 334c Hotfix
1.11.7 16 Feb 2022 f0a2 Hotfix
1.11.6 14 Feb 2022 630e Hotfix
1.11.5 27 Jan 2022 7e1e Patch
1.11.4 14 Dec 2021 b22c Patch
1.11.3 30 Nov 2021 33b6 Hotfix
1.11.2 25 Nov 2021 7844 Hotfix
1.11.1 23 Nov 2021 bf90 Hotfix
1.11 23 Nov 2021 bf90 Major patch (aka "Barbarossa"). Released alongside No Step Back
1.10.8 05 Aug 2021 0aab Hotfix
1.10.7 03 Jun 2021 02cc Hotfix
1.10.6 03 Jun 2021 02cc Patch
1.10.5 15 Apr 2021 502a Hotfix
1.10.4 03 Feb 2021 8878 Hotfix
1.10.3 26 Nov 2020 aa89 Hotfix
1.10.2 12 Nov 2020 f82d Patch
1.10 15 Oct 2020 dd56 Major patch (aka "Collie"). Released alongside Battle for the Bosporus
1.9.3 04 Jun 2020 a7a4 Hotfix
1.9.2 06 May 2020 a73d Hotfix
1.9.1 08 Apr 2020 6d23 Hotfix
1.9 25 Feb 2020 ab9e Major patch (aka "Husky"). Released alongside La Résistance
1.8.2 07 Feb 2020 ce2f Hotfix
1.8.1 14 Nov 2019 aa59 Hotfix
1.8 13 Nov 2019 3241 Major patch (aka "Fork"). Unified PDX launcher.
1.7.1 26 Jun 2019 87c8 Hotfix
1.7 04 Jun 2019 d12e Major patch (aka "Hydra"). 64 bit executable only.
1.6.2 03 Apr 2019 6f7d Hotfix
1.6.1 13 Mar 2019 55d5 Hotfix
1.6 28 Feb 2019 9513 Major patch (aka "Ironclad"). Released alongside Man the Guns
1.5.4 27 Jun 2018 1503 Hotfix
1.5.3 19 Apr 2018 30ec Hotfix
1.5.2 11 Apr 2018 fa9b Hotfix
1.5.1 15 Mar 2018 dbb6 Hotfix
1.5 08 Mar 2018 9515 Major patch (aka "Cornflakes"). Released alongside Waking the Tiger
1.4.2 21 Aug 2017 a48d Hotfix
1.4.1 29 Jun 2017 6e42 Hotfix
1.4 14 Jun 2017 9b1f Major patch (aka "Oak"). Released alongside Death or Dishonor.
1.3.3 23 Feb 2017 2dd2 Hotfix. Note: won't work on Windows Vista[1].
1.3.2 17 Jan 2017 e13a Hotfix
1.3.1 21 Dec 2016 8152 Hotfix
1.3 15 Dec 2016 5256 Major patch (aka "Torch"). Released alongside Together for Victory.
1.2.1 23 Sep 2016 3d5f Hotfix
1.2 16 Sep 2016 bb23 Major patch (aka "Sunflower")
1.1 30 Jun 2016 5d33 Major patch (aka "Red Ball Express")
1.0.1 14 Jun 2016 f680 Hotfix
1.0 06 Jun 2016 8899 Release version

Playing earlier versions

Choosing version 1.0.0 in the Betas list in the Properties of the game in your Steam Library allows you to install this previous version on your computer

When a new version is released in Steam, this normally updates the files on your computer automatically. If you wish to continue to play an earlier version you can do this from Steam. This can allow you to continue to play a game that started in a previous version, if your game is not compatible with the currently released version, or you have technical problems in the current version.

  • Open Steam
  • Click on Library and then on Games
  • Right-click on Hearts of Iron IV and from the menu that just opened select Properties.
  • Click on the Betas tab, where you can Select the beta you would like to opt into.
  • Select the version you want to opt into.

By default it is set to NONE - Opt out of all beta programs (which means that one uses the current version). On this list you will see several versions listed, but not the currently released version. Despite the way this is presented by Steam, these older version are not beta versions, instead they are the earlier released (live) versions. Choosing one of these causes Steam to install the files from that version on your computer.

IMPORTANT NOTE: Per HOI4 forum posts Changes to Playing Previous Versions of PDS Titles and How To Roll-back Your Game Version, both dated 24-Sep-2018, there will be two ways to roll back the game to a previous version. One for versions that are from before the General Data Protection Regulation (GDPR) changes and one for versions that are after. This can allow you to continue to play a game that started in a previous version, if your game is not compatible with the currently released version, or you have technical problems in the current version. The steps listed above will not work for versions released before October 1st, 2018; please use the How To Roll-back Your Game Version.

Checksum and mods

checksum in the launcher (in this case 334c)
in-game checksum (in this case a7a4)

The vanilla checksum can be seen in the bottom right corner of the launcher. The four characters that are displayed in parentheses after the version number are the checksum.

The final checksum can be changed by the debug launch option and mods that you have enabled. (Note that not all mods affect the checksum.) You can see the final checksum in-game under the main menu when you load the game (it's also referred to as the in-game checksum). For all intents and purposes this is the relevant checksum.

For achievements it's important to have the standard checksum in-game, which in turn depends on which version of the game you use. On the top of this page you can read what's the correct checksum for the version you use.

For multiplayer you usually want the standard checksum as well, since one can only play with people who have the same checksum. If you want to play multiplayer with mods that change the checksum you need to make sure that all the involved parties use the same checksum-changing mods. (Otherwise you won't have the same checksum and therefore it won't work.)

If you have a non-standard checksum---although you don't have mods enabled that change it---try clicking on the "Clear user directory" button in the launcher. That fixes most problems like that.