I was using the trial, and uninstalled the Ecommerce module, because I didn't think that I'd be using it.
But now I think that we will use it, so I tried to reinstall it.
The /Sitefinity/Administration/ModulesAndServices page says that the module is active, but I don't see anything in the user interface.
I have restarted the application from Visual Studio, without success.
An URL such as localhost:60876/Sitefinity/ecommerce/ redirects to localhost:60876/Sitefinity/dashboard.