With a quick test it works, though can't say how well when/if you really need it. You select a drive -- removable media like USB sticks are shown -- and perform a quick scan, and then are given the option to perform a deep scan, which takes Much longer. Along the top of the window you can select which types of files to search for, while after a scan you'll see the results in a column on the left broken down by file types. You're also given the option to save the results and open them later. As with many [most?] of these recovery apps, the file path and name may or may not be accurate. Some [not all] files can be previewed before recovery, and unlike some recovery apps, there's no indication of the likelihood a file can be fully recovered.
Activation with the giveaway key works with the [tiny] setup file you can download from the product page. I recorded just short of 100 new registry entries for uninstall, the app itself, and activation info. Besides the program's folder, folders are added to ProgramData & Users\ [UserName]\ AppData\ Local\. I copied the program's folder from a VM [where I monitored the installation] to my regular copy of Win10, where it registered and seems to run fine. I did have to use a 2nd key however.
Odds of successful recover decrease unless you use a recovery app Immediately after losing, e.g. accidentally deleting a file, especially with an SSD because of trim, which proactively clears deleted files from storage. In fact it's not unheard of to unplug a PC as soon as you find you lost a critical file to reduce the chances that the file's data will be overwritten or cleared. Though often requested when a recovery app is on GOTD, the ability to create a bootable USB stick with the app is a bit rare, possibly because of the iffy nature of trying to create a universally compatible bootable USB stick. A portable version might possibly work with a WinPE USB stick created from the Windows ADK -- alternatively AnyMP4 Data Recovery could be installed and activated on a Windows To Go drive. You can also create a disk/partition image backup of the drive with the lost file(s) using the bootable USB stick you create with your backup app, *as long as you backup everything, including free space*. You can then run recovery on the restored or possibly the mounted backup.