Update BDM URL and mention Windows and macOS builds

README.md

@@ -36,7 +36,7 @@ Symbol files allow you to indicate where code, data, test and image data blocks
 
 The instructions of the Game Boy CPU (SM83) have different lengths, and data can be interleaved with code in the ROM, so it is not possible to always accurately identify where an instruction starts and stops. Defining code blocks in a symbol file can help to avoid problems with mgbdis trying to disassemble in the middle of an instruction. 
 
-If you do not have a symbol file, you can try generating one with my Game Boy emulator - [Beaten Dying Moon](https://mattcurrie.com/bdm-demo/). It can generate a symbol file with code block definitions based on the the addresses of the instructions that have actually been executed while you have been playing the game, avoiding instruction alignment issues.
+If you do not have a symbol file, you can try generating one with my Game Boy emulator - [Beaten Dying Moon](https://mattcurrie.com/bdm/). You can either use the web demo, or there are builds available for Windows and macOS. It can generate a symbol file with code block definitions based on the the addresses of the instructions that have actually been executed while you have been playing the game, avoiding instruction alignment issues.
 
 To use a symbol file with mgbdis, it should exist in the same directory as the ROM and have the same name, except change the extension to be ```.sym```.