You&#x27;re correct about MAS apps stopping when the certificate expires.  Several of my purchased MAS apps were broken to the point of being unusable when Apple&#x27;s MAS certificate expired [1].  It happened in mid November 2015, but Apple didn&#x27;t completely fix it until the end of January 2016 [2].<p>[1] <a href="http:&#x2F;&#x2F;www.macrumors.com&#x2F;2015&#x2F;11&#x2F;12&#x2F;mac-app-store-apps-damaged-expired-receipts-issue&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.macrumors.com&#x2F;2015&#x2F;11&#x2F;12&#x2F;mac-app-store-apps-damag...</a><p>[2] <a href="https:&#x2F;&#x2F;support.apple.com&#x2F;en-au&#x2F;HT205702" rel="nofollow">https:&#x2F;&#x2F;support.apple.com&#x2F;en-au&#x2F;HT205702</a>