Dear Player
Please quit the game, update Steam to the latest version and try to start the game again.
If the above method does not work, please go to our website https://support.partyanimals.com/login , and create a ticket with a topic describing the issue, and the time you encounter it. Then attach the zip file to the ticket and click send.
We will get back to you as soon as we find out what's going wrong.
Thank you for supporting Party Animals!