Going to RGL settings see there installed games choose GTAIV and turning off automatic updates! To avoid RGL updates you can go offline.

If you can't do it so for RGL version better don't install any textures mods or cars because this increase chance for updates, It has double check, anyway if you see update in this way you need to change all files again. Sometimes it shows 0 bytes update and it's fine, also update happens when you restart pc/rgl or rare when you close the game after just replace files again it works.

Before installation, if you have in your GTA4 directory the ShaderOverDax1 folder, you should delete it !

After installation, if you want to change the settings again so before you should delete the ShaderOverDax1 folder too !

2020 Complete Edition ASI Loader + ScriptHook

https://www.gtainside.com/en/gta4/mods/161408-2020-complete-edition-asi-loader-scripthook/

IV Tweaker - Modloader & Limit Adjuster

gtaforums.com/topic/979531-iv-tweaker-modloader-limit-adjuster-for-gta-iv/