This is a set converted from my Natural Drawing and Painting Media Brushes: Photoshop Brushes to work in Affinity Photo, but they should also work in Affinity Designer in raster mode. Full license rights are included with the download in a PDF but basically:
Users are free to create personal and commercial
products with this product without attribution.
You may NOT: Share or re-sell this brush pack in part or as a whole.
Visit my digital art blog at https://theartsquirrel.com for in depth articles about digital art.
Christine's Basic Brush set for Affinity Photo/ Designer (in raster mode)