You will need Docker and Docker Compose installed to run Open Contracts. We've developed and run the application a Linux x86_64 environment. We haven't tested on Windows, and it's known that celery is not supported on Windows. For this reason, we do not recommend deployment on Windows. If you must run on a Windows machine, consider using a virtual machine or using the Windows Linux Subsystem.
If you need help setting up Docker, we recommend Digital Ocean's setup guide. Likewise, if you need assistance setting up Docker Compose, Digital Ocean's guide is excellent.