This is the asset : Animal Controller (Malbers Character Controller) | Animation Tools | Unity Asset Store
Of course, you first gotta bribe the maker for a custom contract!! 
Using the asset in a game to sell is the main usecase of the asset store.
The one thing you are not allowed to do is share the asset in raw form like as part of an open source project.
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Yes, you can.
Full licensing rules you can find here (section 3): Asset Store Terms of Service and EULA
You can also learn the “License agreement” for target asset separately below the “Buy” Button:
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