UPDATE from the Autodesk Knowledge Network Site:
Autodesk® AutoCAD® 2017 Exchange App Autoloader Hotfix

This Hotfix addresses a problem with Exchange Apps that target the AutoCAD 2017-based products.

Description of Problem: Exchange Apps may not display on the Add In tab after installing the AutoCAD 2017 Service Pack 1 if settings are reset. Commands for Exchange Apps may no longer work. Newly installed Exchange Apps might not load.

The following products are affected after installing the Service Pack 1 for AutoCAD 2017-based products:

  • AutoCAD 2017
  • AutoCAD Map 3D 2017
  • AutoCAD Civil 3D 2017
  • AutoCAD Mechanical 2017
  • AutoCAD Electrical 2017
  • AutoCAD Architecture 2017
  • AutoCAD MEP 2017
  • AutoCAD P&ID 2017
  • AutoCAD Plant 3D 2017
  • AutoCAD Utility Design 2017

If the solution provided by Autodesk does not resolve the issue, this is the alternative fix to try:

If you have installed the plug in application and it does not load when you launch AutoCAD, you may need to try this fix:

Locate this file:

Within the XML file, there is a call to load a DLL file.

Modify that line in the XML file to read like this: