You can't download Sabre Interact Airport 5.3 because the software is not available for public downloading. The program is developed by Sabre Airline Solutions and the only way to acquire it is to contact the Sales Department. You can get in touch with them using
+1 682 605 6750 (America),
+65 6215 9500 (Asia, Pacific),
+44 208 538 8539 (Europa, Middle East, Africa) phone numbers.