This downgrade patch allows you to go back to version v220.127.116.11 of GTA IV. Apparently this is considered the best version which is best optimized and the least buggy and graphics closer to the Xbox 360 version.
Disclaimer: This method is for advanced PC users and although it was extensively tested and works for me and many other users I do not take responsibility if your downgraded game does not start. Once again - it is recommended to attempt the downgrade on a separate copy of GTA IV folder (the one that has GTAIV.exe), you may put this folder anywhere and rename it as you wish. You must have write permissions to this folder and all its subfolders and files. If you are downgrading your main GTAIV installation DO make a backup first! Downgrade requirements and stepsDirect downgrade 1.2.0.X-> 1.0.X.0 is supported. In general the downgrade works for any GTA IV withoriginal pc\audio\config files and was successfully tested on 18.104.22.168 PROPHET release based and22.214.171.124 Xatab and FitGirl repacks (have original radio), 126.96.36.199 FitGirl repack installed "Withoriginal music sets for radio" (has bundled old radio downgrader), 188.8.131.52 clean Steam version (needs old radio downgrader). 184.108.40.206 FitGirl repack (has bundled downgraded radio sfx data but needs older 1.0.X.0 audio config). Remember that 220.127.116.11 does not support DLCs and if you need them you must also read the 18.104.22.168 section below and downgrade to 22.214.171.124 instead.
This method is for offline play only, if you need multiplayer you will have to replace XLivelessAddon with GFWL + Zolika's multiplayer addons/mods or GTAC.Special note for FitGirl 126.96.36.199 Repack downgradeThis repack already has downgraded radio data - no need to download radio downgrader from first step! You need toa) Run bundled "Downgraded Stations with Old Vladivostok FM.bat" - it will place correct radio data into pc\audio\sfx.b) Get older 1.0.X.0 audio config - download and unpack 10X0_audio_config.zip to GTAIV folder. Steps for 188.8.131.52 downgrade · (This step is not needed if the game already has original radio config and sound files installed) Download and install GTAIV Complete Edition Radio Downgrader (RGL/Steam) old IVCEDOWNGRADE.rar ~637 mb - note that you need old downgrader, the newest version at -iii-iv-various-gta-downgraders/ will not do for 1.0.x.0 downgrade (it will freeze after Concrete Jungle mission) as it has pc\audio\config files that only work with 1.2.0.x.
ATTENTION: on the first run of 184.108.40.206 GTAIV.exe may complain that you need to restart the system - it is normal, no need to reboot, just run the game again and it will always be starting OK later on.
If the game doesn't start with error "The application has failed to start because its side-by-side configuration is incorrect..." it usually means runtime problem and you need to download and install vcredist_x86.exe from Microsoft Visual C++ 2005 redistributable. For 220.127.116.11 downgrade all steps above for 18.104.22.168 downgrade must be used with following modifications: Obtain the 22.214.171.124 patch instead of 126.96.36.199, unpack title_update_7_EN.zip, put update_unpack.bat to title_update_7_EN folder that has .msi/.cab update files and run it from there. Move all files and subfolders from opened GFWLTitleUpdateRoot folder to GTAIV folder. No need to copy 188.8.131.52 fonts No need to add -noprecache if you go with DXVK renderer (recommended) Download DLC integration pack (20 Mb), extract it to GTAIV folder and run DLC.bat from there. If downgraded game does not start there are probably newer 2020CE-compatible .asi files left that conflict with older exe, for example newer FusionFix will not work with 184.108.40.206 GTAIV.exe and it will just exit on start. Move away all .asi files except XLivelessAddon.asi from GTAIV folder and plugins subfolder and then when game successfully launches you may install 1.0.x.0-compatible .asi versions. Running with XlivelessAddon(recommended)XlivelessAddon has integrated XLiveless with GFWL DLC support, SecuROM patch, menu skip, VRAM detection fix - it is reported to yield fps gains as it avoids extra code from launchGTAIV.exe. It also supports redirection ofsettings storage - 220.127.116.11 settings will not conflict with existing SETTINGS.CFG left from18.104.22.168+.
ATTENTION: the type of game you are starting or loading must be the same as running in current session. For example if during launch main GTAIV was loaded then you can start only main GTAIV game using Game / New or load only savegames for main GTAIV - if you try to start new TLAD/TBOGT game or load a TLADT/TBOGT savegame the game will crash. It probably happens because older GTAIV.exe can't switch loaded script.img on-the-fly. If you want to start or load another type of game that is different from the type of currently running one you must select it first in the game startup menu during next GTAIV.exe launch. If startup menu is skipped by SkipMenu=1 in XLivelessAddon.ini you may hold Shift key during GTAIV.exe launch to display it. Alternatively you may set SkipMenu=0, start new game of desired type, then when you have a savegame you may set SkipMenu=1 back - on subsequent launches XLivelessAddon will skip menu and load your latest savegame. Running with Xliveless (obsolete) This section is not needed if you are running the game with XLivelessAddon.· Delete/replace leftover GTA IV settings file. If file %LOCALAPPDATA%\Rockstar Games\GTA IV\Settings\SETTINGS.CFGhas size of 1469 bytes (e.g. it is left from 22.214.171.124+) either back up anddelete it or replace it with 126.96.36.199-compatible 1437-byte version;
This tool allows you to easily downgrade the Steam/RGL Complete Edition (188.8.131.52 and up) of GTA IV to either 184.108.40.206, 220.127.116.11 or 18.104.22.168!
You'll need to patch a retail version of GTA4 to the 22.214.171.124 build, download the quick tool Xliveless to replace a .dll file in the GTA4 directory, then finally download iCEnhancer 2.1. NeoGAF has more detailed instructions.
Fourth official patch for the English version of GTA 4 126.96.36.199.Operational update for the English version of the game:- Increased efficiency of use of available resources, depending on the detected operating system version.Download: Patch188.8.131.52.zip 2b1af7f3a8