Let’s assume you have the files. Here is the clean install process to avoid the dreaded "WS10" or "SecuLauncher" errors.
Step 1: Delete social club remnants
Navigate to C:\Program Files (x86)\Rockstar Games\Social Club and delete everything. 1.0.4.0 cannot talk to modern Social Club.
Step 2: Use the correct EXE
Do not use LaunchGTAIV.exe. Only use GTAIV.exe.
Step 3: Set Commandlines
Create a commandline.txt file in your root directory. Paste these magic words for 1.0.4.0:
-norestrictions
-nomemrestrict
-availablevidmem 2.0
-percentvidmem 100
-framequeue 2
(This helps the old memory management of 1.0.4.0 handle modern GPUs). gta iv 1.0.4.0 download
Step 4: The "File Check Fix"
Because 1.0.4.0 tries to check if you tampered with files.txt, download a File Check Fix.asi. Place it in your root folder alongside an ASI Loader (like Ultimate ASI Loader).
Step 5: Launch Turn off your antivirus temporarily (false positives happen with ASI loaders). Run as Administrator.
Once you secure your gta iv 1.0.4.0 download, you open the door to the golden age of GTA IV modding. Here is what you should install immediately:
Before you attempt to downgrade, be aware of the downsides: Let’s assume you have the files
If you own GTA IV on Steam or Rockstar Launcher (current version ~1.2.0.43 or higher):
Crucial Warning: If you own the game on Steam, you currently likely have version 1.0.8.0. You cannot simply install 1.0.4.0 over it. You must use a Downgrader.
For Retail (Disc) Users:
The community has created repacks of 1.0.4.0 that include Xliveless and a No-CD crack (required because 1.0.4.0 expects a disc in the drive). (This helps the old memory management of 1
Since this is a 15+ year old patch, you will hit snags.
| Error | Solution |
| :--- | :--- |
| RMN40 (SecuLauncher) | You need a No-CD crack (legally allowed for personal backup). Or use the dsound.dll from the downgrader. |
| "Out of video memory" | You have too much VRAM. Add -availablevidmem 0.8 to your commandline. The patch gets confused by 4GB+ VRAM. |
| Resolution stuck at 800x600 | Delete Settings.cfg in Documents\Rockstar Games\GTA IV. Then run as Admin. |
| Constant stuttering | You forgot the File Check Fix.asi. The game is re-checking file integrity every minute. |
| No audio/music | Install the old GFWL Redistributable (just the client, not the login) or update your DirectX 9 runtime. |
The biggest reason for the 1.0.4.0 demand is modding. Many of the most popular script mods—such as the Simple Trainer, LCPDFR (the predecessor to LSPDFR), and complex vehicle handling mods—were built specifically for the 1.0.4.0 executable. While modders have eventually updated their tools for newer patches, 1.0.4.0 remains the most stable environment for legacy mods. It allows users to alter the game files extensively without the stringent file verification checks found in the newer 1.0.8.0 version.