To run the client you need the following items:
This is simple: just unzip the zip file and you're ready to run it.
At the command prompt where you start programs, write java SimpleClient xsafile savefile, where xsafile is an XML document containing the URLs of XSA documents you wish to check and savefile is the file where you want to store the results of the check.
If you have problems using the kit, send me an email.