Parapet for Revit 1.2.1 (Hub, Link, Audit)  -  manual installation
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For each Revit version you use, copy BOTH of these into
  %AppData%\Autodesk\Revit\Addins\<year>\
    <year>\Parapet.Hub.addin
    <year>\ParapetHub\   (whole folder)
Then start Revit -> Parapet tab. Hub and Link offer a 30-day trial (Licenses button); Audit is free.
https://parapet.app/docs
