A very interesting post. I didn't know about this issue related to Evenicle 1 and Evenicle 2. I guess more and more games are receiving this treatment since it's not convenient for a developer to put too many details in something that is completely pointless from a selling point of view (at least in the market of Japanese eroges).
So...when it comes to this game (as well as the first one) is literally impossible to find an uncensored version since there is literally nothing under the mosaic.
As for the uncensored picture, I think you are referring to this one:
[VN] - [Others] - [Completed] - Evenicle 2 [v1.00] [AliceSoft] | F95zone
The pic was decensored using an AI known as DeepCreamPy, it's a tool to make unofficial decensored images, but the results got with this type of technology are not very consistent: sometimes you get decent images, while other times you get terribly-looking pixelated images. Even with the use of this AI the art still needs to be redrawn most of the times. In fact I think the picture was also edited through programs like Photoshop because the images still need that too.