"The Miner's Adventures"

I can't install the patch. It says it can't find the Heroes 3 file.
And another question: after installing the patch, is it easy to restore the previous settings?

Run the installation from the folder with the game files!

I did it this way. I copied the game folder and named it "Heroes + patch", copied the patch into the game folder, clicked install, and that's it!
I have a version of the game with the patch and one without the patch! If the patch is removed, I'll just delete the folder and that's all :)