Many free PDFs are scans from the 1980s. The Kannada characters are blurry (e.g., ‘ೞ’ misread as ‘ಳ’). An updated version uses Unicode Kannada fonts (Nudi or Kedage) so text is searchable and copyable.
Be cautious with sites offering direct downloads, as they may host malicious software or viruses. vatsayana kamasutra book in kannada pdf upd