Since the official store is no longer active, the ProShow community shares free slide styles and project templates through several platforms:
Searching for ProShow Producer style packs can help you transform basic slideshows into cinematic experiences. Since Photodex (the original creator) has discontinued the software, finding free styles now requires visiting community blogs and template sharing sites. Where to Find Free Styles SlideshowBlog.com : A reliable source for free slide styles. Navigate to the "Freebies and Giveaways" style proshow producer free download
If you're interested in trying out ProShow Producer, you can download the free trial version from the official Photodex website. The free trial version is fully functional and allows you to create and edit slideshows, but it will expire after a certain period of time. Since the official store is no longer active,