Hi thanks, can you confirm it's '/sites/all/libraries/juicebox/' directory and not '/sites/all/libraries/juicebox/jbcore' ? Thanks!
Yes. As far as I am aware, you should copy the contents of the 'juicebox_pro_1.5.1/web/jbcore/' folder (not the 'jbcore' folder itself) into the '/sites/all/libraries/juicebox/' directory.
That's what the module's instructions say and, as far as I can recall, they are correct.
Also do we have to drupal build the entire image albums across the site or just replacing the script files would suffice? Thanks!
I'm pretty sure that as soon as you replace the contents in the '/sites/all/libraries/juicebox/' directory, all galleries created by the module should instantly turn Pro (with no branding, no image limit and all Pro configuration options becoming active). If you do not see this, then try clearing your browser's cache before reloading your website to be sure that your browser is not still using older cached versions of the Juicebox core files.
Please note that the Juicebox module for Drupal was not written by ourselves, and as such, I am not overly familiar with its code, interface or inner workings.
If you need further support for the module, then please post in the Drupal forum where its author should be able to help you out.