Here you can run the Drawing Add-Ins Manager for either a 32-bit or 64-bit OS. If you install Visio and/or AutoCAD after installing SI 2018, you will need to run the appropriate Drawing Add-Ins function in order to "link" SI 2018 to the drawing programs.
When run, the following form will open:
Click the [Install D-Tools SI Drawing Add-Ins] button and you will get a confirmation notice:
If you are not sure whether to run the 32-bit or the 64-bit Drawing Add-In, run them both.
Click here for a list of compatible versions of Visio and AutoCAD.