This thread is resolved. Here is a description of the problem and solution.
Problem: Custom html widget is not visible or Display Widget plugin does not work
Solution: The issue has been reported to the plugin other a few times: 1. https://strategy11.com/display-widgets/#comment-108 2. https://strategy11.com/display-widgets/#comment-123
This will take a lot of time to troubleshoot and to create the fix. And, spending sources on a discontinued plugin is meaningless.
This one is similar to Widget Logic if you want you can try: https://wordpress.org/plugins/widget-logic/
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