I have tried to download the app but am getting this error

This app can't be upgraded.
There are problems that prevent this package from being installed.
Unable to install.The unmanaged package "Salesforce Adoption Dashboards" is already installed in your organization. You will need to uninstall it before installing a new version.

However when I look at my installed packages it is not there. I am not sure how to delete or remove something that I don't see.