Ginglese, Thank you for using the Dell Community Forum. Have you tried uninstalling the current version and then installing the newer version? 
I have a DELL precision M4500 With windows 7 64b French. I have the DCSU V 1_2 and this software reports an update available for the DCSU (1_2_1). I selected the update but it failed to be installed, reports saids : -(DupAPI:validatecommand) : *** DUP capability check faile -DUP command not supported by his payload, display user help -name of exit code : UNKNOWN OPTION -exit code set to 11 (µ0xB)   i have tried to download the update directly and i have an error when executing the installer DCSU_Setup_1_2_1.exe : -Error reading setup initialization file   any tips ?    
DCSU - Dell Client System Update wont update TO 1_2_1