Good news: You can read many "Kavanagar-style" classic Tamil books for free or very cheaply using legal platforms.

: Lists several Tamil books by authors like S. Kandasamy Mudaliar , including Kavanagar Kanmanik Kannikal and Aarogya Unavu

provides free video content on health, wealth, and self-motivation, which covers many themes found in his books. Legal Alternatives

Moreover, distributing or downloading copyrighted books as free PDFs without authorization from the rights holder is illegal in most jurisdictions and violates ethical publishing standards. If "Kavanagar" refers to a specific author or title still under copyright protection, I cannot provide or encourage unauthorized downloads.