Caroline450: Thanks everyone :-)
I am not used with all that stuff...is someone can explain me how to process. I have already downloaded the GOG downloader on my laptop but the game does not show...
Thanks for your help, I really appreciate it!
What Aliasalpha said, but the download location might not be obvious. The downloader has an Options button that lets you specify where the installers are saved. Look in that location for the installer file, which you can then copy to another PC of yours (don't give it to friends, family etc).
After copying the file to the other PC, double-click that installer file and it'll go through a 'file integrity' check. Once that is completed, you'll see the setup screen. You can probably figure out the rest from there - there are only a couple options for setup, like installation location and whether or not you want to install add-ons and such.