try

=COUNTIFS(Table_owssvr[Install Date],">="&Formulas!R38,Table_owssvr[Install Date],"<="&Formulas!S38,Table_owssvr[Element Title],"=Encore at Platform",Table_owssvr[Type of Branch],"<>New Branch Opening 2016",Table_owssvr[Type of Branch],"<>New Branch Opening 2017")