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")