An interesting bug discovered. I had installed custom brush pack, then I deleted the brushes from that arpack and the original folder also. So there is no more files from that arpack anymore - only brushes created based on top of that brushes and they have a different names. If I try to install that arpack again I get this:
So I chosen to repair and nothing changed - the arpack still not installed. I checked tools presets folder and custom brush folder also.This package file has already been installed. If files from it have been lost or deleted choose Repair to replace them, or Cancel to stop installation.
As it turden out I had to chose show installed packages and uninstall them before I could install them again. This way it works.
p.s. they clearly overdid it