When you say "downloaded" what exactly did you do? Were you using an app on your device or were you using a browser on a PC?
The usual method of installing an app is to use an app store like Google's Play Store (if you have a Google account) or others like Amazon's app store. In either case the app gets installed automatically rather than just downloaded, so you must be using a different method.
Sorry about all the questions, they're needed to help resolve your problem.
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