To prevent Downpour from detaching from the console (and to view debugging messages), run the following command:
downpourd -c [config-file] -d
This is currently the only way to run Downpour on Windows.
To report a bug found in Downpour, please go to the Github bug tracker.
You can get a current development snapshot from Github at https://github.com/jjongsma/downpour.
The main module code is in downpour/. You can immediately view your changes by running ./downpour-debug.sh in the main directory.