Some tweaks to make the mod fit more in line with Portal 2
To install, make sure portal 2 is installed.
Download the files and extract the "portal remastered" folder from inside the zip file to your "sourcemods" folder located by default in "C:\Program Files (x86)\Steam\steamapps\" (If you don't have a "sourcemods" folder, you can create on in "steamapps").
Close steam by clicking on "steam" in the top right corner, then click exit. Reopen steam and you should see Portal Remastered inside your steam library.