התקנת דיסקוס נכשלה עקב תוסף Custom Wizard

Sorry for the pause @vsiryxm
The mentioned issue was about fresh Discourse core update and one of the side plugins (Custom Wizard). It is solved now and authors updated the plugin.

If you don’t use Discourse plugins at all - It’s not related to your problem.

Have you tried official Discourse guide to install pure Discourse?