Excel 2013 is compatible with Dashboards 4.1 not Dashboards 4.0.
However there are some issues which are reported with 2013 and would be fixed in the future releases.
So you can install Dashboards 4.1 i.e. 2013 and it should be fine with the compatiblity part.
The script error that you are getting is more likely because of the proxy settings/internet connection.
As said earlier when you launch Dashboards application it will look for some external links for the initial start page and advertisements and when it fails to connect you may get error in launching the application