For Windows Users:
The real “fastest” way is to open a Command Prompt and issue these commands:
set path=%SystemRoot%;%SystemRoot%\system32;
set classpath=.
then execute the file you downloaded.
Note: these settings are only applicable for the Command Prompt where you issued them. DO NOT change the System Environment Variables (e.g., do not make a global settings change).
The problem appears to be related to long classpath or path (not sure which since both are long).
Generally speaking, remove any spaces in your classpath by using the 8 character file names for directories that contain spaces (e.g., Progra~1 for Program Files…). You can see these names by issuing dir /x from a Command Prompt.