What is Gillian's GTA IV Modding Guide?

Updated

Gillian's GTA IV Modding Guide is a community-made website that walks you through modding Grand Theft Auto IV, from preparing your game files to installing essential fixes and optional extras. It is not affiliated with Rockstar Games, Rockstar North, or Take-Two Interactive, and the site itself notes that following its steps may violate Rockstar's End User License Agreement (EULA) — which means Rockstar support may decline to help you if something goes wrong. If you want a structured, maintained path through GTA IV modding rather than piecing together scattered forum posts, this guide is built for that purpose.

Who runs it and how it's maintained

The guide is written and maintained by "Gillian," who describes being inspired by catsmackaroo's guide in 2021 — originally translating it for a Russian audience before it grew into a standalone project. A modpack followed, and the website launched in 2023 to reach an English audience after the content outgrew Steam's format.

As of the September 2026 update, the site operates in minimal maintenance mode. Rather than retiring, the author collapsed hard-to-update information into a single page called Companion Mods. Two community members, Pingwinek1234 and Dashii, help with modpack updates, though the author still performs the final steps.

What the guide covers

The table of contents lays out the full path:

Section What it's for
Preparation Getting your game and tools ready
Drag-and-Drop Archive Working with packaged mod archives
Downgrading Downgrading the game and the radio
Optimization Improving performance
Additional Setup Extra configuration steps
Essential Modding Core mods: FusionFix, ZolikaPatch, Various Fixes
Companion Mods Consolidated companion mod information
Extras Multiplayer, trainers, launcher, modloading
Resources Mod dependencies, OpenIV
Troubleshooting Fixing common problems
Similar Guides & Modpacks Alternatives and comparisons

When to use it

Use this guide if you want a curated, opinionated setup for GTA IV modding — particularly if you're aiming for the "improved experience" the author describes building to replace lower-quality modpacks. Be aware of two conditions before starting:

  • EULA risk: The guide openly states that following it may violate Rockstar's EULA, and that support may refuse to help as a result.
  • Attribution: Most modifications listed are not the author's work; credit belongs to the original mod creators unless stated otherwise.

If you prefer to avoid EULA concerns entirely, or you only want a single small mod rather than a full overhaul, a lighter approach may suit you better.