I have right now installed this games.... apparently i can't choose language and the games only start in English.

How i can change language right now ?

I don't have the game, but check your library, a few Gog games come with separate installer for each language offered, maybe that's also the case for Emperor's Tomb. E.g. Master of Orion 2 looks like this. You'll have to select and download the Italian installer, and of course uninstall the English version before installing this one.

If that's not it, maybe the game folder contains configuration files such as "setup.exe" "config.exe" or something like that.

If that's not the case either maybe you need to change the language settings in some .ini file, but this is the point where I'll have to stop guessing and hope someone who know what they're talking about will come and help you. :D

I can confirm........ the italian games has a totally different setup..........