Since there's only one ( in this command, that's the problem. Apparently, it doesn't like the ( in the title of what you want to download: "%5B720p%5D%20LK21.TV%20Warcraft%20(2016)", which, after some translation is "[720p]LK21.TV Warcraft (2016)".
Asking the owner of the file to rename it would be an easy solution. Or see if you can download it from any browser in stead of from the shell.
If you feel it should work, file a bug with Apple.
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