The Internet Archive serves as a robust, though legally precarious, repository for Pimsleur Russian courses. For a learner seeking a comprehensive, audio-first introduction to Russian without the upfront cost of the official subscription (which currently retails for approx. $20/month via Pimsleur's official app), the Archive provides a viable, albeit gray-market, alternative.
So you have downloaded the 30 MP3s. Now what? Passive listening will not work. Here is the optimal study schedule. pimsleur russian internet archive