Hello @Soph_From_Nuo and welcome to the forum 
You should have a file called pximango.bundle.
Go to Settings → Manage Resource Libraries then use the +Import button to import that file and the contents of the bundle should then be activated and available as brush presets in the Brush Prests docker.
You will also need to download the fix_patterns.bundle file as noted in the reply from @pixelmangogogo above.
Then Import that one as well.