Well, it didn't work for me. And I once made a thread about it not working and nobody said it is working for them. But w/e. It's not that hard just to take match ID and watch in game is it?
Well, managed to get it working without the button :)
As for your case, it doesn't work because the dota:// protocol isn't associated to any programs\actions to take in Windows. It can be fixed. It has nothing to do with dotabuff, afaik.
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Where did the "Watch replay" button go ?!