I understand you're looking for the "GrutBrushes Art Brushes 500" pack as a free download, and you specifically asked for paper (likely meaning the paper textures or the brush pack itself).
Features of the Gutbrushes Art Brushes 500 Collection grutbrushes art brushes 500 free download
If you need free high-quality Photoshop brushes for painting: I understand you're looking for the "GrutBrushes Art
Official free downloads are limited to specific trial sets and weekly rotations rather than the entire 500-brush library. Understanding the Art Brushes 500 Collection grutbrushes art brushes 500 free download
Once you successfully complete your grutbrushes art brushes 500 free download, you need to install them. Here’s how to do it on any version of Adobe Photoshop (CC, CS6, or newer):