This is the stock Percussion kit with the upright bass added. No other changes.
The Percussion kit does not have an instrument at 39 (handclaps in Standard) or 40 (brush sweep in Brushes). Otherwise, it should work out-of-the box with most songs with bass and give a mellow feel.
The file inside the zip file is a 7zip file (7z). If you are on Windows PC, you will need to download and install the 7zip app (https://www.7-zip.org/) so you can open it and unzip the DRM file.