Installation error: INSTALL_FAILED_VERSION_DOWNGRADE
說明你手機里已經裝的軟件版本比你要安裝的軟件版本要高，所以不能安裝。
你只要刪除你安裝的應用便可以重新安裝了或者將AndroidManifest.xml的versionCode改大點，越大的表示版本越新
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