I built this site www.photoimpressions.org many years ago. It has worked fine until php 7.3.33 is no longer supported by my host. I just purchased BL5 and have no idea how to migrate the site (if even possible).
I started to read the instructions but am not even sure they apply to me.
looks like you’re on CE4 and also using CE4 Publisher. You should be able to migrate your albums and Cart.
You will need to create new page, album, and album set templates, but you could just use the default templates to start and then create new templates and assign them to pages, albums and album sets.
If using custom css or phplugins, you’ll need to start over as the html structure has changed and so has phplugins.