This model (latest edition), was given to me by a friend, also the paintjob is from his hand. I just love how this kroxi looks like a mini carno (meaning the paintjob). This will probably be the look of my army.
I think this is quite an old edition actually (I have at least two of the models), minimally because it is a metal one so automatically this is WAAAY back. It's a good one though.
Don't worry, I don't play AoS. I'm just saying that these are the most up-to-date models. You've got classic miniatures there! Be proud!
These models were actually released during 7th edition Warhammer Fantasy, long before the dark times, before AoS. 8th edition saw no new models releases of Kroxigor models, nor has AoS. So as @Lizards of Renown stated, these are the most current sculpts of Kroxigors. Your model is from 6th edition. I have a few of them as well! And here is an even older sculpt from way back in 5th edition...