Hi Ben,
Have you tried the last step that is listed at https://optiwave.com/forums/topic/not-getting-30-day-evaluation-license-opti-fiber-not-working/#post-68308?
If you are now able to open the page at http://localhost:1947/_int_/features.html, try uninstalling, then reinstalling the evaluation. The evaluation license is added during the installation of the evaluation.