1. Go to https://www.moddb.com/mods/absolutehd/downloads/doom-3-roe-absolute-hd-17 and download the folder with textures.

2. Unpack the archive, open the root folder ( with all files inside ), select all files, copy them.

3. Open your Doom3 ROE folder, where the game is installed: C:\Program Files (x86)\Steam\steamapps\common\Doom 3 --> example of my folder

4. Open d3xp folder and paste in all the files with replacements

5. After that, come back one level up ( to your Doom3 folder ), open base folder, find the file called DoomConfig.cfg

6. Open DoomConfig.cfg with notepad or any text editor, find the following parameters:
seta r_customHeight
seta r_customWidth

7. Set them to
seta r_customHeight "1080"
seta r_customWidth "1920"

8. Save the changes.

9 Now, go to your steam library, choose collections - you will see all your games listed.

10. Find Doom3 ROE title, right click on that, choose properties section. The general tab will pop up, here find the Launch options field and insert +set fs_game d3xp, close the window.

11. Enjoy great graphics and FULL HD.

Huge shout out to mod developers and package creators. The mod was assembled by Cverdzislav. The mod includes:


Sikkmod 1.1Roe by Sikkpin;
High-poly models meshes by Sikkpin;
High-poly weapon LWO;
Enhanced Doom 3 models 1.1;
Texture Pack by Monoxead;
Texture Pack 1.0 by Wulfen ;
Texture Pack 2.0 by Wulfen ;
High-res Pipes for Wulfen's textures;
High-res textures from Redux mod by Clear_strelok;
Parallax Occlusion Mapping plugin;
Skin pack by Xio;
D3 Fullshadows 1.4;
1024x1024 jumbo size monsters skins;
1024x1024 textures 1.3;
Enhanced particle effects;
Doom 3 HQ Mainmenu by 6th Venom;
Assets Pack for Doom 3 by CED.