Well first did you delte the preset.material file and replace it with the new one? If all those .jpg preset files are gone... then did you replace the material?
Yeah, you should probably do that. But when you downlaoded the preset, did you get it as Preset_4 or just as all the files like jpg and the material file? If you got it as the Preset_4 folder, then just copy the preset_4 folder, and replace it with your oringinal.
Try pasting those files into another preset folder. Then go inside the material file and do this:
(I picked 5, you caqn pick any number you want.)
(http://i45BannedImageSite/30n975u.jpg)
Click edit, replace. Find what: preset_4 Replace with: preset_5 (The preset number you chose.) and click replace all. (Sorry this picture looks horrible. xD
Okay, go to a preset folder where you have not made any of your custom presets. Then, paste all of your downloaded pres3et files inside of there. Then, go into the new preset material file, open it with NotePad. On the top left you should see File Edit Format View Help. Click Edit. A drop down box should appear, you should see Replace on the drop down box, click it. Another box should appear that says Replace on the top left corner of it. There should be a Find what: and a box where you can type something in. Type in in that box next to Find what: preset_4.
Now, below it, should be a Replace with: and a box to type in. In the box to type in, put in preset_5 (Or the preset number you put the files in, 6, 7, 8, 9, 10, 11, 1, 2, 3, 12...) Then click on Replace all. And then, click on File, Save. Now you can test that in the game. But not as Preset_4, test it as whatever preset number you chose. Got it?