My first attempt to install DMX4 used the default httpRuntime value for executionTimout, resulting in an error. So, as recommended in the doc's I increased this value to 300 seconds and installation appears to stall at about the same point, only now instead of getting a request timeout, my web session timesout after 30 minutes of idle time. Database tables do get created but there was no modification to the web.config and no trace of the module in my desktopModules folder. Folder permissions look fine.
How can I troubleshoot?