DVDFab Photo Enhancer AI is a large program -- the offline installer is available under downloads on the DVDFab site, at ~1.4GB, while the installed app takes up ~3.83GB. Installation isn't bad with one annoying quibble -- logs & temp files are by default in [My] Documents, which isn't the best choice if it's synced / backed up to One Drive. Every time you change a setting while working with an image in the app, until you turn it off, Win10 will display a message reminding you that files deleted in Documents will also be deleted in One Drive. The app's settings will let you change the location of log files, but that's it. OTOH Not requiring a somewhat confusing process to set up an account to register the app is Very welcome.
I did a quick test of the AI Noise Reduction on a scanned copy of an old grainy color photo [I *think* it was 400 ISO color film]. It did a great job, outperforming the one step, digital, & AI noise reduction options in PaintShop Pro 2022, & Franzis Denoise Pro -- Photoshop's Neural filters do not include noise reduction yet [it's on the wait list :( ].
I then tried the colorization -- I should have tried that 1st, since after the success of the noise removal option it was a huge disappointment. In all fairness, you can't compare the size & resources of DVDFab with Adobe, and Adobe's Colorize Neural Filter has only gotten really good after a year's + training on probably several billions of images. Still, the colorization module is one you'll want to skip.
PhotoPerfect **may** well help if the photo isn't too bad to start with, but if/when a photo needs more difficult editing, e.g. a color cast or say a faded photo with color cast, you'll need at least a good photo editing app. Likewise Sharpening can help, depending on the image -- the sharpening available in the denoise module will often likely be a better choice.
DVDFab Photo Enhancer AI's biggest limitation IMHO is that it won't open Photoshop [.psd] or RAW image files, though .tif import does mean P/shop import isn't critical. And a P/Shop compatible plugin would be ideal. All in all a definite keeper, if only for the denoise module, from a reliable company that's been around a long time.