Hi Dareios,
You don't have to put the files downloaded anywhere in particular, just make sure they are in the same folder you have the jar file (in case you are not specifying full paths in the executionsBio4j.xml file).
Regarding executionsBio4j.xml file you just need to have it at the same level as ExecuteBio4jTool jar file, (otherwise you would simply need to specify the full path to where the file is located.)
The file executionsBio4j.xml represents the execution of different programs sequentially. Each <execution> tag includes the program parameters inside <argument> tags.
HTH
Cheers,
Pablo