Normally I don’t really understand why one would use those upscaling filters, but these seem to look pretty decent.
http://forums.qhimm.com/index.php?topic=18549.0
The AI Gigapixel software says it was trained on millions of photos so that it can “upscale” with potentially interesting results.
Interesting. I recently had a calendar printed from older photos (some only 4 megapixels), and a few of the pages really would have benefited from upscaling (provided the results are not just interesting, but actually usable.)
Too late now, but out of curiosity, I might see what the result would have been. Hope their trial version isn’t as terrible as LGs Miracast macOS application, which worked for 5 minutes before demanding payment 
.