The suffix of brush format is. abr。 I can't open the compressed package you downloaded, and there is no compression software. If the format is correct, you can unbind it and put it in PS- Preset-Brush. Indicates that the opened document is not of the document type indicated by the document extension (for example, *). Private Sector Division. Tif, etc. ).
That is to say, to open a psd file, but this file is not a psd file. Generally speaking, this happens because there is something wrong with the file. The copied file has data loss and incompleteness, or there is a problem when saving the file. Then there is the wrong extension tag. You can "open as" to specify a file format so that you can open the document and try it.