With the release of the PDFImport Neo plugin, for the DraftSight 2020 SP0 version, following the natural product development road map the the support of PDFImport plugin versions has been dropped, and we no longer ship the installer of earlier versions.
In order to ensure access to at least the previous release, you can find the installer of the plugin for DraftSight 2019 SP3 in the PDFImport Neo webpage:

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