Hi there Davide and sorry for the late response,
First of all I would recommend you to install QACMS using composer instead of using any the tagged versions, the beta2 package is known to be a little bit buggy under certain environments.
The `core.php` file doesnt exists in CakePHP v3.0 projects (version of cake which QACMS uses), its equivalent is now `app.php`.
Anyway, QACMS projects use none of those (core.php nor app.php), it uses a simplified and more managable file called `ROOT/config/settings.php`, however this file is only created after QACMS installation completes. So, basically there is no way to enable debugging during installation.... ups! ... I'll fix this asap, in order to allow debugging in cases like this.
As a workaround, you can for the moment hack the core files of QACMS and force debug to be enabled:
Edit this file: ROOT/vendor/quickapps-plugins/cms/config/app.php and simply change `'debug' => false` for `'debug' => true`
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I've prepared a fresh installation using composer and zipped for you. Just unzip, set permissions, run via browser and follow the instructions:
Hope this help,
best regards!