Check for frequent sales—it is often available for a very low price.

It is specifically patched to run on Windows 10 and 11 without the crashes that plague the 2001 original.

It features integrated Steamworks support, making it much easier to find matches online.

The 2001 retail version often suffers from "buffer overflow" errors on modern hardware that only the Steam version has fixed.

If you want to play the game safely and support the developers who are still active today, here is the best way to get it: The Best Way to Play: Battle Realms Zen Edition

It sounds like you're looking to revisit a classic! However, it’s important to note that is a copyrighted work. Downloading it from unofficial "free download" sites often comes with risks like malware or broken game files.