After upgrading (replace design) the smaconne, users can no longer open the App List Page with "HTTP 500 Internal Server Error": Frequently Asked Questions: smaconne: Easily use the Notes app on your iPhone, iPad, Android and other smart device

Make sure that you have signed the smaconne template with your administrator account and then replaced the design.
If you have replaced the design without signing it, smaconne will not work correctly.
For details on the procedure for upgrading smaconne, see "Version Up of smaconne App" in the "smaconne User's Manual".

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I have upgraded (replace design) the smaconne, but the added/changed features are not reflected