Notes for Windows users: On some Windows installations, the APID ToolAssistant plug-in will refuse to load. If that’s the case, you need to download and install the following Microsoft update:
Microsoft Visual C++ 2005 SP1 Redistributable Package (x86)
After installing the VS2005 SP1 redistributables, you must first remove APID ToolAssistant from your Plug-Ins folder, launch and subsequently exit InDesign, and then put APID ToolAssistant back into the plug-ins folder. This cleans up some internal InDesign cache files that get out of sync after an attempt to launch APID ToolAssistant while the computer has some missing DLLs.