關於舊版 App 下載

最近把手上的 Redmi Note 4 Pro 重置之後才發現一個老問題：因為系統實在太舊了，很多軟體已經沒辦法從 Google Play 直接下載，只能回頭去作者的 GitHub 或官方網站自己找安裝檔。

如果你事前有用其他工具把 App 都備份起來就輕鬆多了，例如有些檔案管理軟體就支援將 App 打包壓縮備份，這時候就派上用場。

換成 iOS 的情況就不太一樣了。如果你在系統還受支援的時候就已經購買（或取得）過 App，之後即使裝置系統偏舊，通常仍然可以下載到「最後一個相容版本」。

但反過來說，如果你之前從未購買過，等到想買時才被提醒「系統版本不符合」，那後續幾乎也就沒有機會再下載到相容版本了。

話說回來，蘋果這套「已購項目可下載舊版」的機制，其實是庫克於 2013 年接替賈伯斯之後才逐步成形的良心政策，讓老裝置不至於在重置後直接變成孤兒。

參見

[Apple 開始提供「舊版相容」的 app 讓舊版 iOS 的使用者可以下載適用軟體](https://tw.news.yahoo.com/news/apple-%E9%96%8B%E5%A7%8B%E6%8F%90%E4%BE%9B-%E3%80%8C-%E8%88%8A%E7%89%88%E7%9B%B8%E5%AE%B9-%E3%80%8D-020300639.html) (2013-09-19 Thursday)

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