Sharing or promoting "free downloads" of their paid courses would constitute piracy, which violates copyright laws, the institute’s terms of use, and potentially this platform’s policies.
If you download a lecture, you watch it once. That is passive learning. The Vajiram toppers do this: vajiram and ravi video lectures free download top
For those looking for written content to complement video lectures, the following official sources are available: Sharing or promoting "free downloads" of their paid