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what happens if there isnt a png for me to dl?
im trying to fix some of these creases, but what if there isnt a png for me to download? can i download the larger version of it, and photoshop that, then upload?
i think if we don't have the png version, you can fix the larger version(jpg)
the fixed version should be saved as png,and upload the png file
Use the "best" version available, which is the full size version.

As far as "always" saving as png goes, I'm sure someone will call me git for it but, you can get away with highest quality (level 11 or 12 in photoshop) jpeg if it is already a jpeg and it doesn't add artifacts. It's pretty much a mortal sin screwing up a png that way.

In short:
Don't make it worse (artifacts, photoshop screw ups, excessive cropping etc) when you're trying to improve (fix, stitch, colour adjustments, filtering a scan etc) the image.
Simple enough ^.^