I have uploaded an alpha version of Data Crow 4.0! It can be downloaded from the Sourceforge.net site: Choose Files > Beta version.
This is a zipped version only. Unzip and read the instructions in the txt files.
For testing the server-client make sure to supply a correct -userdir: for the server. The -userdir: command needs to point to an existing user folder. You can create a new one using the client.
For testing the client make sure to start the client using the -client parameter as otherwise it will start the full client.
This is a test version only and is not yet the full and complete 4.0 version.