Ok, I see the link is broken because of wrong case in the GitHub tag. Try here:
https://github.com/zenphoto/zenphoto/tree/Zenphoto-1.4.4 (click on the "ZIP" above).
We think it will work to skip versions, but as said, specific parings have not been tested so there may be issues we do not know of. I would suggest you make a backup of everything and give it a try. If it fails then you fall back to the step-by-step upgrade.
You do not have to install 1.4.4 as that would be the same as installing 1.4.4.3.