Distribute brochures to sales force

I am looking for a solution to distribute product brochures in about 26 languages to members of the world-wide sales force.

I wrote an application around 15 years ago but this is in desperate need of attention so I am wondering if there are any ‘standard solutions’ out there.

Current features:

• Documents organised by language/country by marketing department and updated quarterly
• An index is created by scanning the documents allowing a search function on the client side
• A web application serves documents to client application
• End-users alerted to new documents
• End-users can choose one or more groups to synchronise to their local machine allowing offline access
• Download statistics are gathered for report generation
• View statistics would be good but not currently implemented
• All documents are PDF. All clients on Windows 10