Hello @joserafael.arce,
Thank you for contacting WebViewer support,
As mentioned in the modal, in order to properly verify license keys, it is required for us to have a secure connection, hence the recommendation for https or localhost.
After speaking to the development team, they informed me that in previous versions such as yours an error would still be thrown, but only in the console, which may not have been helpful enough. Hence, a change was made to modify the message and display an error modal.
Hope this answers your question!
Best Regards,
Jacob Romano Carlsen
Web Development Support Engineer
Apryse Software Inc.
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