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[Windom Earle]

FusionFix is a fan-made mod that essentially turns the broken PC port of GTA IV into a faithful remaster. It fixes long-standing bugs, restores missing console features, and adds entirely new graphical and quality-of-life improvements.

Major Fixes & Restorations

• Graphics restored from console versions: proper gamma/contrast, working volumetric lights, soft particles, stronger vehicle reflections, working mirror reflections, and emissive building lights.
• Bug fixes: rain visibility restored, water rendering improved, z-fighting eliminated, model fading fixed, shadows reworked, and anti-aliasing options added.
• Performance improvements: faster load times, smoother cutscenes at higher frame rates, working mouse input, and Vulkan (DXVK) now comes with the mod integrated for better performance.

New Graphical Features

• Sun shafts (God rays).
• Volumetric fog with natural horizon blending and better draw distance.
• Extended sun reach for more realistic lighting.
• Improved bloom and tone mapping that scale correctly with resolution.
• Optional seasonal events like winter snow and Halloween mode.
• Project 2DFX for denser, more realistic distant lights.

Quality-of-Life Additions

• Modloader (Fusion OverLoader): makes installing/uninstalling mods easy without overwriting files.
• Camera options: adjustable recenter delay, fixes for stutter and zoom issues, optional shake removal.
• Gameplay tweaks: always-run toggle, indicators in vehicles, better sniper controls, transparent map, and cheat codes for Niko's gloves/haircut.
• Customizability: sliders for FOV, depth-of-field, and motion blur, plus controller icon packs (including Steam Deck).

Releases · ThirteenAG/GTAIV.EFLC.FusionFix

This project aims to fix or address some issues in Grand Theft Auto IV: The Complete Edition - ThirteenAG/GTAIV.EFLC.FusionFix

github.com

edit: Some small installation instructions
After downloading the game (no mod yet), I recommend to first add these launch options in steam: -availablevidmem 32768 -nomemrestrict -norestrictions (Change video memory value depending on your GPU)
After that, run the game once and set your resolution. The game will probably crash. This is fine.

After that just install the mod, it is extremely easy. Just refer to the readme

Note: After starting the game, you will usually get some Rockstar social club login prompt (the game is in full screen at that point, I am not talking about the rockstar launcher). Just ignore it, it will go away after a few seconds.

The mod will work now and you can change the settings in the different menus to your liking. It is recommend to switch to Vulkan instead of DX9. Also keeping View Distance and Detail Distance at default settings is still recommended if you want the game to spawn grass as intended.
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Also maybe consider donating to the devs, an insane amount of work went into this undoubtedly. (I am not affiliated with this in any way shape or form)

 

[SJRB]

Wow I never noticed that the skyscrapers didn't even render at certain points.

This mod is a crazy improvement, awesome work.

 

[Gonzito]

Its a very good mod but I think the game's graphics need a lot of fixes too. Character models, textures, and assets in general. The game it's too old at this point. There are some good mods out there that improve the look with textures and such but it's definitely time consuming

But I am glad that the community is fixing this game, is one of my favorites

 

[YCoCg]

They've also done a whole promotional website which shows off the majority of the graphical features.

Fusion Fix for GTAIV: The Complete Edition

A comprehensive modification that fixes technical issues and enhances the Grand Theft Auto IV experience.

fusionfix.io

This mod was always required to make the PC version playable but this new update is insane.

 

[Nintendo's Witch]

Best GTA game by a wide margin

 

[MidGenRefresh]

Love PC gaming.

 

[Fermbiz]

I used FusionFix to play GTA IV recently. I highly recommend using this mod if you're going to play GTA IV on PC. Made me realize how amazing GTA IV is, my second fav of the franchise.

After watching that video, I'm jumping back on the Lost and Damned DLC! I never really played it back in the days.

 

[Killer8]

If it's open source then there is zero reason for Rockstar not to use this in their inevitable remaster.

 

[Kupfer]

Best GTA game by far.
Replayed it on the PS3 recently, but I'll try it out again with this mod! Nice!

 

[wvnative]

Does it fix the broken QTE at the end of the game?

 

[YCoCg]

Does it fix the broken QTE at the end of the game?

Yep, it does plenty of physics fixes and that's one of the main ones, can be done at any FPS now.

 

[joeygreco1985]

Jesus I need to play this like right now

 

[nkarafo]

I have a slightly older version of this because the new ones would mess up the night shadows with the cars and the headlight shadows.

Did they fix that?

 

[Windom Earle]

I have added some installation instructions to the OP. The mod itself is easy to install but there are still some tricks I recommend following because the PC version is so finicky.

 

[YCoCg]

I have a slightly older version of this because the new ones would mess up the night shadows with the cars and the headlight shadows.

Did they fix that?

This new version looks like it's added those back as "Extended Night Shadows" in the last options screen, it has three options, off, lampposts and lampposts+headlight

 

[nkarafo]

This new version looks like it's added those back as "Extended Night Shadows" in the last options screen, it has three options, off, lampposts and lampposts+headlight

Thanks, gotta try it to see any further improvements.

 

[hououinkyouma00]

This doesn't happen to fix the radio does it?

For some reason I could never get the radio station mods to work and I miss OG Vladivostok FM.

 

[nkarafo]

This doesn't happen to fix the radio does it?

For some reason I could never get the radio station mods to work and I miss OG Vladivostok FM.

Pretty sure the radio station mods are separate.

I do have the OG Vladivistock in my setup.

 

[YCoCg]

This doesn't happen to fix the radio does it?

For some reason I could never get the radio station mods to work and I miss OG Vladivostok FM.

Use this for the radio content, it's an installer and you can choose what you want.

Release IV-RR-23-05-2025 · Tomasak/GTA-Downgraders

Bug fixes Restored The Classics and The Beat 102.7 from pre-cut files

github.com

 

[Windom Earle]

Wow the volumetric fog is amazing, just saw it for the first time. The vanilla game always looked off when it had the weather change to foggy weather without actual fog appearing.

 

[Rivdoric]

-availablevidmem 32768 -nomemrestrict -norestrictions (Change video memory value depending on your GPU)

2008 vibe all over again.

 

[MDSLKTR]

Any steam deck impressions?

 

[MayauMiao]

I have to confess, I never yet to finish GTAVI but my PS3 died before I got the chance to do so. Now that I got it for PC, I seem to can't bring myself to play the game.