Rh2020 - responsive help backward compatible output in RH2020

Sorry to say it is still true that customisation is lost except with the Indigo skin so you will need to reapply your changes.

CORRECTION

I have received further clarification. 

• When you upgrade any responsive skin that you applied in a Classic version of RoboHelp, any customisation you applied using the skin editor will be applied.
• Any customisation you applied other than through the skin editor will be lost on upgrade. What you can try is importing your responsive skin using the Import dialog. Make sure you click the Keep Using Older Layout of the Skin check box.
• Webhelp skins will not be upgraded. By default the Indigo responsive skin will be applied but you can change that to any of the supplied frameless or responsive skins after the upgrade.

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See www.grainge.org for free Authoring and RoboHelp Information

Your source topics will be converted but the upgrade of the skins is different.

In this topic The Skin Editor (grainge.org) under Upgrading Customised Skins it states the Indigo skin updates. However, I think that may have changed and I will check with Adobe. Meantime though as Jeff has pointed out, the upgrade is made from a copy of your Classic project so you will still have that in its original form. Therefore there is no risk in trying it.

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See www.grainge.org for free Authoring and RoboHelp Information

You realize that RH2017 is the Classic version & RH2020 only supports the New UI that came in in RH2019, right? There is an upgrade path that converts a copy of the Classic project & puts it into the new UI format. However, if you've customized the skin in RH2017, it's highly unlikely that it will be converted too. If you haven't already, I would get a trial copy of RH2020 on a different (non-production) machine, make sure it's all patched up, and convert a copy of the RH2017 project to see if it all goes smoothly and see what the output is going to look like.