Here is a little update:
We couldn't promise it, but here are finally the patchs for both the demo and Episode 3. They have been uploaded on Mediafire.
If you encounter any trouble with these, please report it.
One thing to warn however: these versions don't use the same save locations than episode 2 patch. As result, if you tried to use the original patch with the demo/ep 3, you will have a fresh global save.
As usual, please delete the old patch if you used it.