Okay, a lot of questions.
First, I recommend ATI graphics cards instead of Nvidia:
Uninstall: Simply delete all files manually.
The limited edition does not change the registry, but some additional installers search for it in the registry, so you should also install the .reg file with double click.
The limited edition already contains the Patch and the Add-on. Read here:
Portuguese menu: Use and change the file
Later you can send your version to me, I can make an installer. Menu_Strings.txt0 is not important for you.
In the Menu_Strings.txt I have replaced R with Ð. You can still use the letter R, you do not have to know more, the rest is my job.
Did I forget anything?