Prodeo 2.4 will exclusively run under Arena (pre-installed) and the first time you start Arena it will show a default rating of 1500 ELO. When this is way out of line with your own ELO edit the file player.txt with a text editor.
There are a couple of annoyances because of the limitations an engine will face programming what actually is an interface (GUI) feature. Therefore while playing keep in mind the following rules:
As in normal chess there is no such a thing as a Take Back. When you do you lose instantly. Just avoid that button. That might need some practice as I can tell from experience during development and testing this particular feature.
The New Game button is another story. Besides starting a new game it will also function as your resignation. Of course, the logical exceptions are when the program has resigned already or the game already ended (Checkmate, Draw or Time Forfeit).
A little annoyance will occur in case you resign (by pressing the new game button) Arena will start a new game but does not yet communicate that with ProDeo and thus the ELO update does not appear in the (black) ProDeo window immediately. This will happen with the next move.