I too would use a screen capture and paste into image editing app for a single screen or two, or I have a print driver that outputs images.
I've had several of those print drivers over the years but looks like the current one installed is from PDFCreator. From what I can tell, their free version still has the image print feature.
There's also some sites that offer online conversion. I don't use them since I have software to do it on my end but here is one example:
This free online tool lets you convert a PDF document into a series of optimized PNG images without installing any software.
pdf2png.com