Harry Potter 3 Hi-Res Textures by vargatomi addon

The pack contains a .tpf file you can use with Texmod.

How to use:
0. To even get the game running on modern system, I had to download crosire's D3D file:
Github.com
Just download it & place it in the game's System folder.
To see how to run the game in 4K, follow this video:
Youtube.com
1. Download my mod and unzip it to a folder of your choosing.
2. Download Texmod: Moddb.com
3. Unzip it and open Texmod.exe
4. Click the big Folder button under Target Application and select hppoa.exe in Game Files\system in the game's installation folder.
5. On The Package Mode tab click the little folder button and add my .tpf file.
6. Click Run.
Make sure to choose the highest texture resolution in Options!

That's it! You're good to go.
(It might take a few seconds longer for the game to launch while it loads the new textures.)
You'll have to repeat steps 3-6 every time you start the game, but it will go much faster the second time (Texmod lists recently opened files)