Alright, so you bought on a PC you didn't intended to.
To activate on another one without Internet connection, do this:
- Have your Serial at hand (serial is in your email receipt)
- Install the Trial on the PC you want to use the scenery.
- Launch FS, go in Windowed Mode (not always necessary, but it's better)
- Select "Register Serial", insert your serial number, it will ask if you want to activate. Reply "Yes", the screen will go black and, after a while it will automatically detect there's no internet connection, select "Offline"
- A dialog will appear with some options, select "Activate Using a Different Computer that has Web access" - It will present you with a serial number called "Installation ID". Save this code to a thumb drive, and go to any PC with web access.
- Go to
http://activate.esellerate.net and type this ID into the field. It should reply back with another long code. Save this code and return to the non-internet connected PC.
- Launch FS and wait again for the manual activation screen to come up. Now select "I already have an Activation Key and would like to Activate Now". Type the code you obtained from the web from the other PC, and it should activate.