If you are in Croatia or Serbia, check your local (National Library). Many libraries offer apps like eZaki or e-Knjige where you can "borrow" the PDF for 14 days. This gives you a pristine, official scan.
If the PDF quality is frustrating you, consider the audiobook. Several Balkan audiobook platforms (Audible via Amazon, or local services like Bookmate) offer the Croatian/Serbian narration. Listening to Socrates’ wisdom with a native voice actor adds a new dimension to the story. put mirnog ratnika pdf best