安裝方法如下：
1.通過appstore下載到了舊版本的ipa文件。先安裝個PP助手。將手機連接到電腦！
在itunes界面點擊資料庫；
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2.在資料庫找到前面下載的ipa文件，如下圖所示，點擊鼠標右鍵選擇在資源管理器顯示；
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3.找到下載到的ipa文件，鼠標右鍵選擇用PP助手安裝；
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4.PP助手啟動，檢測手機連接！開始連接手機；
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5.檢測完畢，點擊安裝到手機按鈕；
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6.應用開始安裝，如下圖所示，等待安裝完成。
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擴展資料:
ipa文件實質是壹個zip壓縮包(不是rar或7z包)，包含3個組件:payload目錄下的.app目錄，這個是軟件的主程序;iTunesArtwork，實質是壹個無後綴名的png圖片，用來在iTunes中顯示圖標;iTunesMetadata.plist，記錄購買者信息、售價等數據。