After installing the add-in, select "Import Idf" under the INSERT menu.

Specify input parameters and click OK. You will be prompted to select a board file (mandatory) and a library file (facultative). Once finished, you will get the geometry with components and keep out sections.

Supported files combinations are: .emn/.emp, .brd/.lib, .brd/.pro, .bdf/.ldf, and .idb/.idl.

Input parameters are:

• import pcb only: yes/no
• holes to create: component pin, conductive via, mounting purpose, tooling purpose, other
• PCB color: green, red, black, blue, white, yellow, violet
• component color: all grey or according to the standard reference designators (see below)
• create an individual component: yes/no
• capture design history: yes/no
• anonymize component: yes/no

Standard reference designators supported for component color are: C, CN, CONN, D, F, IC, J, JP, K, L, P, Q, R, RN, RT, RV, U, VR, X, XT, XTAL and Y (see https://en.wikipedia.org/wiki/Reference_designator)

Colors can be adjusted by editing the idf.adsklib in the resources/materials folder (use the "MODIFY > Manage material property" menu). 

https://autode.sk/2st36Sa

https://autode.sk/2sBLQJL

Install:
The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. Or, simply double-click the downloaded installer to install the app/plugin.

Uninstall:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Fusion 360.
To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button.
Or, you can uninstall it from 'Control Panel/Programs and Features' (Windows 7/8.1/10), just as you would uninstall any other application from your system.

The add-in supports IDF version 2.0 and 3.0:

https://www.simplifiedsolutionsinc.com/images/idf_v20_spec.pdf
https://www.simplifiedsolutionsinc.com/images/idf_v30_spec.pdf

The add-in doesn't support IDF files that contain panels.

The import process can become slow if:

• capture design history is set to yes
• component pin or conductive via are selected in the drilled holes parameters