Ok, I followed the steps found here:
http://www.showkase.net/support/#pro-install
But, in the step #3 says:
"To upgrade Juicebox upload the Pro jbcore folder, replacing:
admin/plugins/juicebox/master/jbcore"
Could you please explain it better?
*Why should I replace the folder when they are the same?...The showkase version I downloaded from the received link already is a Pro Version, isn't it? If not, where could I found the 'Pro jbcore folder' so I can replace the folder pointed in the path above?
It's what it have: http://wandersonandrade.com.br/showkase/
Wanderson Andrade