You're looking to download Cisco ASA 9.14.
To download Cisco ASA 9.14, you'll need a Cisco account. If you don't have one, create a free account on the Cisco website . cisco asa 9.14 download
The Cisco ASA (Adaptive Security Appliance) is a legacy product, and its support has been moved to the Cisco Secure Firewall (formerly known as Cisco Firepower) platform. You're looking to download Cisco ASA 9