Hey! Thank you for your interest. This was part of a bundle raising funds for indie studios badly affected by last year's GDC cancellation. As such, it was only available for a limited amount of time to those who kindly donated to help the cause. Hope you understand :)
Ah, in that case, if you'd like to use these assets you can send me a proof of purchase to my email. Then I can send you a link. Feel free to get in touch via the contact form on my website