Go to Settings on the Fire TV Stick by clicking on the gear icon.
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Select My Fire TV.
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Select Developer Options.
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Click ADB debugging and turn it ON.
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Select Install unknown apps.
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Select the Find icon from the FireStick home screen then click Next.
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Search for the Downloader app then install it.
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Click Download.
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Launch the Downloader app you just installed and click the URL box.
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Enter https://mirrors.kodi.tv/releases/android/arm/kodi-20.0-Nexus-armeabi-v7a.apk?https=1 in the URL box then click Go.
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Click Install.
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Click Done.
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