Legally, it is a grey area. The game is abandonware – the developers no longer sell it or support it. As long as you own a legitimate copy (or once did) and are not redistributing it for profit, personal sideloading is generally considered acceptable by the gaming community.
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If you encounter a specific error not covered here, check the XDA Developers forum thread (Search: Ranch Rush Android 14 fix) . The community is active and helpful. ranch rush 1 download for android install