Out of the Park Developments Online Manuals
 
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Installing Your License
Once the eSellerate version of OOTP is installed and you have purchased a license, all that remains is to prove to the game that your license is valid. Until you install your license, OOTP will run in "demo mode," which is full-featured, but limited in duration.

To activate your license without an internet connection, use the instructions in this article from our Knowledge Base.

Note: The eSellerate version allows you to install the game on two (2) machines. However, there are rules on mixing licenses between operating systems. See this Knowledge base article for details on where you can use your two licenses.