If are you are a licensed user with a current subscription, you can retrieve your permanent v2019 license code using the MyAccount page.
See this article for the Visual Editor details - Visual Editing for XML Comments
Detailed changes by build:
VS2017 v15.6 compatibility update.
Fixed the issues reported after the initial Beta 3 release.
In the Beta 3, we are continuing to build out the Visual Editor features as well as improvements and fixes.
This update is recommended for VS2017 users.
First public Beta if the new v6.x - our apologies for a bit of mess in versioning here.
Also see What's New in GhostDoc v5.x
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