Are you serious about it? is a game engine, although it can be used for rendering, it is not the most suitable for Moi3d users. . it is a Blender fork and the programmer now works for the new version of Blender2.8..And learning how to use the Real-time Rendering engine takes time. The best way is always to use Cycles or wait for the month of October where the new version of Blender will most likely be available.
The KREA interface has changed but the “Real time rendering” function is still there (even in free)
Of course, you can use any program as a source! Even Krea itself, for make a meta AI, doesn't even larsen effect!