I updated to RoboHelp 2020.4.173 to fix a problem I was having with .css files. After the update, I no longer see Responsive HTML5 as one of the Output Presets. I only see the following presets:
None of these options will work for me. Where did Responsive HTML5 go?
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Click the + sign above the existing presets and add one there. If there was one before it should still be there but that will fix it.
See www.grainge.org for free Authoring and RoboHelp Information
Thank you, Peter. That took care of it.