I Googled it and got this link.
There is no direct link from the PTE forum, as there once was.
https://www.slideshowclub.com/files/category/1-slideshows/
See this.
https://christinewiddall.co.uk/tutorials/pan-and-zoom-in-pics-to-exe/
On viewing this tutorial again, I see it is based on a much older version of the software but the principle is OK.