After trying for hours to get this mod to work, following installation and video guides, I realised why the textures in game weren't changing at all for me (even if the slider showed up in the options). So after you replace the bin files, you install the 4 separate mod folders using the witcher mod manager and they should show up in the mods folder but after this it will not work still... So after that go to your mods file (.settings), it was in a separate Witcher 3 folder which had also my save game files in it. Different to my main Witcher 3 folder with mods, bin etc. Then open the mods file in notepad in there you should see the [modHDReworkedProject] and the same for 2,3,4 under each it should say Enabled=0, change it to Enabled=1 and do the same for each part. Change the priority to align with that in your mod manager mine was Priority=1 for all. And there you it should work now. Open up the game and test the textures, the easiest is by comparing the rocks or barrels. Hope this helps.
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HOLY FUC* (2 comments)
So after that go to your mods file (.settings), it was in a separate Witcher 3 folder which had also my save game files in it. Different to my main Witcher 3 folder with mods, bin etc. Then open the mods file in notepad in there you should see the [modHDReworkedProject] and the same for 2,3,4 under each it should say Enabled=0, change it to Enabled=1 and do the same for each part. Change the priority to align with that in your mod manager mine was Priority=1 for all. And there you it should work now. Open up the game and test the textures, the easiest is by comparing the rocks or barrels. Hope this helps.