安装方法如下：
1.通过appstore下载到了旧版本的ipa文件。先安装个PP助手。将手机连接到电脑！
在itunes界面点击资料库；
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2.在资料库找到前面下载的ipa文件，如下图所示，点击鼠标右键选择在资源管理器显示；
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3.找到下载到的ipa文件，鼠标右键选择用PP助手安装；
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4.PP助手启动，检测手机连接！开始连接手机；
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5.检测完毕，点击安装到手机按钮；
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6.应用开始安装，如下图所示，等待安装完成。
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扩展资料:
ipa文件实质是一个zip压缩包(不是rar或7z包)，包含3个组件:payload目录下的.app目录，这个是软件的主程序;iTunesArtwork，实质是一个无后缀名的png图片，用来在iTunes中显示图标;iTunesMetadata.plist，记录购买者信息、售价等数据。