Mir package is free. Downloading it you must accept the license agreement below (the PDF version is also available):
Registration
We kindly ask you to register the downloaded software by sending an email to Yury Vishnevskiy (see here for address) with brief information on your hardware and OS configuration.
For the optimal development the most important for us information is the CPU model, OS type, version and architecture.
Below are the most recent versions of Mir for different operating systems.
All of them passed our internal tests and are ready for normal usage.