Is a PDF version of Shri Madhwacharya Brahma Sutra Bhashya in English or Kannada available?
Note: The source, nageshsonde.com is no more accessible. Following links to January 2020's snapshot from Internet Archive
nageshsonde.com is a good website which provides most of works of Anandatirtha (Madhwacharya) with English Translations.
Here is the book you're looking for: Brahma Sutra Bhashya English Translation
I didn't find the Kannada Translation.
The English translation of Vedanta/ Brahma Sutra is given here with commentry of Sri Madhavacharya.