If you are trying to install or mod the game using these files, follow these general steps:
: If lighting looks strange or portals aren't transparent, you may need to edit your autoexec.cfg file in the portal_rtx/cfg folder. Portal.with.RTX.part3.rar
For a complete visual walkthrough of every test chamber and the final boss, you can watch this guide: Portal With RTX Full Walkthrough (All Puzzles | DLSS 3) YouTube• 10 Dec 2022 If you are trying to install or mod
If you've already installed the game and are looking for a guide to complete it, here are the key resources: 100% Achievement Guide for Portal with RTX -
: Right-click on Part 1 and select "Extract Here" using a tool like WinRAR or 7-Zip. The software will automatically pull data from Part 3 and others to rebuild the full file.
100% Achievement Guide for Portal with RTX - Steam Community
: You can follow a Full Puzzle Walkthrough to clear all chambers from 00 to the final boss fight.