For non-Tamil readers, you may need to wait for an official translation – or learn Tamil, as Cho himself would have wryly suggested.
As for the PDF download, there are various resources available online that provide information on Hindu mythology, including the Maha Samudram and the Chho. Some popular sources include: cho hindu maha samudram pdf down better
While some unofficial sites may claim to offer free PDF downloads, there is to download the full series for free. Most available PDF files are low-quality scans that may contain errors or be incomplete. For non-Tamil readers, you may need to wait