Thanks for your reply.
If possible,please let the customer send some screenshot about his issue,
make sure when add a printer,at “select Printer Software”,the printer's driver should be there,
please send me ,I do need it to confirm.
I tried adding a printer to Mac 10.10.3(sorry,we didn't have OS 10.10.4,10.10.3 and 10.10.4 are almost the same),
and it is OK,I can't tell what happened actually.