Not all apps, some older apps (e.g. Tweetbot 1.xx) stopped working permanently &amp; can&#x27;t be fixed, because Apple doesn&#x27;t allow old versions to be re-downloaded from the Mac App Store.  It&#x27;s convinced me to stop using the MAS and I&#x27;ve been re-buying my MAS apps direct from the developer wherever possible.<p>I commented more fully over here: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10562030" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10562030</a>