This is an older version -- the giveaway key of course will not work with the current version. The app opens to a sort of menu page where you select the tool you want to use. Note that to view the complete window when using a tool, with monitor scaling set to 150% in Win11, I needed to go into the properties for VideoProcConverterAI.exe, select the compatibility tab, then under Change high DPI settings, set the High DPI scaling override to System. Note also that since this is local AI [runs on your PC/laptop rather than using online servers], you need a graphics card [or discreet GPU in a laptop] for the AI tools to function properly. The non-AI tools are basically the same as they've always been in Digiarty's VideoProc Converter, though likely improved compared to earlier versions.
Using AI tools to process video is going to take a while, and benefit from higher end, preferably current generation video cards with lots of RAM, especially Nvidia. Super Resolution does work on still images/photos -- once you open an image file the controls in the window change to reflect the fact you're working on a still rather than video file. With my low end AMD RX 6600 running full tilt processing a photo took a few minutes -- multiply that by 30 to 60 images for just one second of video and you can imagine how long it would take. At default settings it did do a decent job, with the notable exception that colors in the enlarged photo were decidedly muted. While the product page may hint at image improvement, I didn't see any... in fact despite trying Very many apps/services that make that claim, the only software I've seen make an improvement was Photoshop's Neural filters and Luminar Neo, and then with several caveats, e.g., I usually have to mask off areas of the photo where the process hurts rather than helps.
For many, software that can perform AI photo/image upscaling is especially handy, though not for the reasons you're probably thinking. If/when you use AI to generate or edit an image, it works with &/or uses a fairly small frame, often 1024 x 1024 pixels. The result may be stretched, sometimes much larger, especially when you're editing, e.g., adding something to or changing a photo you uploaded, but you still only have 1024 x 1024 pixels worth of data. That lack of resolution can sometimes be very noticeable, particularly when it effects only a portion of the photo. Upscaling the image usually goes a long way towards fixing that.
The GOTD download for VideoProc Converter AI 7.6 is double sized because it contains both the Windows & Mac installers. The installed app takes up a bit less than 900MB, with a 2nd folder in Users\ [UserName]\ AppData\ Roaming\. Like most Digiary software, Windows registry is mostly untouched.