Yeah thats what I was planning on doing, I have tried the 'Attribute Image Replaced Main Product Image On Sel' addon and it seems to do nothing... and I was going check Ajax, but searching around the forums, it seems this is a relatively highly sort after feature that a lot of people are having trouble getting working... So I was hoping someone who has this happening with version 1.50 might have been able to comment on how they managed to achieve this...

Testing on a fresh ZenCart might show some more results as I have been trying to test various addons on an active site which could be having issues with other addons / modifications already on it...

If anyone has any info on getting this happening that would be great as this is the one feature the friends I am making the cart for have specified needs to be there... Even if they have to pay for a 3rd party addon or manual PHP coder to achieve it... (I was just hoping it could be quickly and easily done with an addon...)