Usage: nustool [-cDmpr] [-k decrypted_key] [-K encrypted_key]
       [-V version] titleid

Downloads and optionally decrypts a title from NUS.

 -c              try to decrypt the title using the CETK key
 -D              if decrypting the title using the CETK key, use the
                 development common key to decrypt the titlekey
 -k [key]        the titlekey to use to decrypt the contents
 -K [key]        the encrypted titlekey to use to decrypt the contents
 -h              print this help and exit
 -l              download files to local directory instead of /tid/ver/
 -m              keep meta files (cetk, tmd); usable with make_cdn_cia
 -p              show progress bars
 -r              resume download
 -v              print nustool version and exit
 -V [version]    the version of the title to download; if not given,
                 the latest version will be downloaded

If none of -c, -k and -K are given, the raw encrypted contents
will be downloaded.

All files are downloaded into a titleid/version directory.