1st off, to activate you first fill in name & email address on a GOTD site using a URL in the readme.txt file. I had downloaded the GOTD ZIP file, closed the browser, & later copy/pasted that URL into Firefox, & it did not work -- I didn't get the needed form page. SO I started over, didn't close the browser after downloading, but opened a new tab & copy/pasted the URL from the readme.txt file -- that worked. I got the email right away, which contained another URL, this time to the page where you'd purchase Impresso Pro showing $0 cost. After filling in all the blanks [there's no verification of whatever data you fill in -- the form is just hard coded to require that data] the order # & key were displayed. Entering the key in the app [under the Help menu] works this time -- there have been glitches in the past with JixiPix apps -- and the menu item to enter the key goes away.
Impresso Pro 1.8.15 follows the same basic design principles as the other JixiPix apps they've been generous enough to give away, though this one is less toy-like than their Happy Holidaze for example. It works in Win11, the included plugin works in the P/Shop CC Beta, & a Lightroom template is also included. Impresso Pro uses layers -- the 2 rectangular boxes in the upper right that appear when you 1st start the app & import an image. You can turn them on/off clicking the circles [radio buttons], add/delete layers using the + & -, reset or set a new default clicking the documents icon, & adjust the sliders until you're satisfied. Unfortunately the options for saving your work are a bit sparse -- since there are no jpg quality options available you might want to save your image as a .tif file, then open that & save it to jpg in another app. That doesn't matter of course if you're using Impresso Pro as a plugin.
JixiPix apps seem to all be a bit unusual when it comes to their installation. Impresso Pro includes both 32-bit & 64-bit versions -- which one is installed depends on whether you're running 32-bit or 64-bit Windows, though the 64-bit version includes both 32-bit & 64-bit plugins. Those plugins are added to C:\Program Files (x86)\ Common Files\ Adobe\ Plug-Ins\ CC\ & C:\Program Files\ Common Files\ Adobe\ Plug-Ins\ CC\ -- nowhere else. Installing Impresso Pro adds the program's folder, along with a separate folder for uninstall, and 3 folders are added to Users\ [UserName]\ AppData\ Roaming\. Of those 3 folders, JixiPixCommon includes a JixiPixCommon.plist file [which is editable in Notepad] -- you might want to save a copy before activating a new JixiPix app, since I've had things go a bit haywire once or twice. The other 2 are the Adobe folder that holds the Lightroom template, & the Impresso Pro folder that contains the presets. The registry gets one new key that stores whether or not you want to check for updates when 1st prompted by the app.