It may help on some photos, but using one of my regular test images, a scanned 35mm print with some film grain, it didn't make enough of a difference to justify even starting the app. The image is shown divided in half, one half the original, the other half [allegedly] optimized. There's one big button -- clicking it once is supposed to optimize the image -- clicking it again adds further optimizations according to the message window. If you click the right edge of the button you get a dropdown menu with the individual optimizations available. Trying them individually, top to bottom, I could see a *slight* difference, that then went away when I optimized the contrast -- the result was basically identical to the original, and this photo is Not a great snapshot. In case it was an issue with the giveaway I downloaded & installed a trial of the current Photo Optimizer 9 -- same results plus an annoying feature (?) that added a file I opened to the collection at the bottom of the app's window, where I had to find & select it before I could try editing.
Monitored in a Win11 64-bit VM, installing Photo Optimizer adds the program's folder to Program Files\ Ashampoo, with additional folders [for marketing] in ProgramData & Users\ [UserName]\ AppData\ Local\, an Ashampoo folder with 24 photos in the Public Pictures folder, and a folder in Users\ [UserName]\ AppData\ Roaming\. It also adds C/C++ runtimes from Microsoft. Unfortunately running the app without going through the installation process [to skip those runtimes] did not work. The app's installer caused a rewrite of the driver database in the registry, with around 45k new entries. It's very possible I missed something [I'm Not going through 45k entries], but it looked like the app gets one key, with an added key for uninstall. While I did not test this aspect, it looks like this GOTD activates using an ID from the current copy of Windows, so it probably needs another key using another account for each added copy of Windows that you want to use it with.