Make a backup of your gta3.img, gta3.dir and generic.txd before you do this!

How to install it?

Replace gta3.img, gta3.dir and generic.txd from the "models" folder with the one from the "GTA VC mipmap with tweaks" folder.

You will also need a plugin for this to take effect (download the latest version): https://github.com/DK22Pac/ViceMips/releases
And have Ultimate ASI Loader installed for the plugin to work: https://github.com/ThirteenAG/Ultimate-ASI-Loader/releases

You can also install it using Modloader if you want.