There's no mention of AutoCAD add-in update for AutoCAD 2020 in the 3DxWare v10.6.4 release note document, the PDF only include this:
3DxAutoCAD 5.6.0
2019 Jan 24
3DxAutoCAD (x64) 5.6.0
2019 Jan 24
And the 3DxWare64\components64\3DxAutoCAD\3DxAutoCAD64.msi file creation date is
February 12, 2019.
While 3DxWare64\components64\3DxAutoCAD\3DxAutoCAD64.msi\Data1.cab\_dxautocad.arx20 timestamp is January 24, 2019, date is ahead of AutoCAD 2020 official release date
March 27th 2019 by Autodesk.
https://blogs.autodesk.com/autocad/intr ... d-lt-2020/
By The AutoCAD Team
March 27, 2019
The ReadMe.txt file modification date is
April 19, 2018, totally out of sync.
There must be some lack of human labor resource.