To try again to install the add-in (requires administrator permission) 1. Open the Dashboard. 2. Click Add-ins. 3. Select ...

To try again to install the add-in (requires administrator permission)
1. Open the Dashboard.
2. Click Add-ins.
3. Select the add-in, and then click Install the add-in on computers.

Or

For some add-ins, the publisher of the add-in provides help information on a website.
To access the help information for an add-in (requires administrator permission)
1. Open the Dashboard.
2. Click Add-ins.
3. Select the add-in, and then click Get help with the add-in.