If you get this error when try update your script then try this:
You need to set the value of upload_max_filesize and post_max_size in your php.ini :
; Maximum allowed size for uploaded files. upload_max_filesize = 10M
; Must be greater than or equal to upload_max_filesize post_max_size = 10M
After modifying php.ini file(s), you need to restart your HTTP server to use new configuration.
If you cant edit config server, try updating using ftp service (http://support.jodacame.com/knowledge-base/i-cant-update-youtube-music-engine)