Many vintage styles are designed for 4:3 ratios (like old TVs). If you are working in a 16:9 widescreen project, ensure your photos are cropped correctly so they don't look stretched. Conclusion
Photodex ProShow Style Pack Vintage is a professionally curated collection of slide styles and visual effects designed to give digital slideshows a nostalgic, old-school aesthetic. Originally created by Photodex for their acclaimed ProShow software lineup (including ProShow Gold, ProShow Producer, and ProShow Web), this pack allows users to instantly transform modern digital photos and videos into classic, timeless memories with just a few clicks. ePHOTOzine Photodex ProShow Style Pack Vintage.zip
If you have managed to get your hands on the .zip file, here is how you can put it to work in or Producer : Many vintage styles are designed for 4:3 ratios