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That would be pirated. You must download it only directly from Google Play.well, i think you can try this way, come to a source to download apk file for pc. I think up to now, you should consider this way. last week, i also download Clash Royale at httpchoilieng.com. it still runs smoothly.
good luck!
p/s: it may be useful: http://choilieng.com/apk-on-pc/com.pixel.gun3d.apk