It's been about a year since I signed the contract, but I still haven't received any images.
You will not receive any images, because the images are already there!
But the software doesn't sees them. This can be caused by various reasons.
Please check this article for the solution:
https://support.native-instruments.com/hc/en-us/articles/7228347290909-Thumbnail-Picture-Icons-are-Missing-in-the-Kontakt-Browser