When I look in the Roku channel store, I can find no channel with the name Hotstar. Of course, it's possible it's available somewhere other than where I'm located (in the US). But if you can't find it in the channel store from your location, there is no way to add it to your Roku.
Roku devices are not like many Android based devices that allow sideloading unofficial channels. Each channel must be made available through the official channel store, and the channel provider is the only one that can authorize where it is available. In this case, only Disney can make their channel available in your location. Since Malaysia isn't a country officially supported by Roku, it's unlikely Disney will make their Roku channel available there.
Dan
Roku Community Streaming Expert
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