“The installation failed” for app store plug-ins

When installing a Fusion 360 app from the Autodesk App Store, the installer simply copies the so called bundle (hence the .bundle extension on the folder) into the appropriate "ApplicationPlugins" folder – the location depends on where you installed Fusion 360 from:

• Fusion 360 installed from the Autodesk web site: ~/Library/Application Support/Autodesk/ApplicationPlugins
• Fusion 360 installed from the Mac App Store: ~/Library/Containers/com.autodesk.mas.fusion360/Data/Library/Application Support/Autodesk/ApplicationPlugins

For some reason, you may have the access rights for the folder set to "Read only", and so the installer cannot write into it:

And that can cause the installation to fail:

You can simply right-click on the correct "ApplicationPlugins" folder, select "Get Info" and provide "Read & Write" in the "Privilege" column for your account.

Hopefully, that should solve the issue.

If that does not help, then you could follow these steps:

1) Get an app that can read pkg files, like http://www.mothersruin.com/software/SuspiciousPackage/

2) In that program, open the pkg file that you downloaded from the Autodesk App Store

3) Select the .bundle folder, click "Export" and navigate to the appropriate "ApplicationPlugins" folder:

• Fusion 360 installed from the Autodesk web site: ~/Library/Application Support/Autodesk/ApplicationPlugins
• Fusion 360 installed from the Mac App Store: ~/Library/Containers/com.autodesk.mas.fusion360/Data/Library/Application Support/Autodesk/ApplicationPlugins

4) Then click "Save"

Once you restart Fusion 360, it should now be able to find and load the add-in.