What i need do to make it work?
I have as you see on the image minimum 1 image and max25 but does not work.
I do not upload any image and no message, and listing is created without image.

@officela
Please create support ticket and provide steps to reproduce

Changed JQuery version to 3.x.x and it's working now!

@officela
It is strange as plugin was made on jQuery v1.x

Yes, its working only with 1.x.x, previously its not working but when I changed jquery version from 3.x.x to 1.x.x then its asking to upload image, but with 3.x.x product is uploading without asking to upload image.

How to fix this issue? because its not working with 3.x.x

thanks in advance     

Make sure you only have 1 jquery validation script on your site. If there are multiple, best way is to remove them (usually manual enqueue in theme item-post.php or it could go from some plugin as well - then it will be defined in that plugin index.php)