The most reliable way to get an updated digital version is through official platforms like Google Play Books, Amazon Kindle, or the publisher’s (McGraw Hill) digital library.
The updated version of K. Subramanya’s is the 6th Edition
You can also try searching on platforms like:
: The book has been refreshed with additional solved examples, review questions, and objective-type questions tailored for competitive exams like GATE , ESE , and State AE .