The ASA must have the HTTP server active.

If your ASA 5505 is already running, follow these steps to retrieve the launcher: Where To Download ASDM-IDM Launcher - Cisco Community

Your management PC must be in an IP range permitted to access the ASA’s internal IP.

Before downloading, ensure your ASA 5505 is configured to allow web-based management:

Cisco Asa 5505 Asdm-idm Launcher !exclusive! Download Info

The ASA must have the HTTP server active.

If your ASA 5505 is already running, follow these steps to retrieve the launcher: Where To Download ASDM-IDM Launcher - Cisco Community

Your management PC must be in an IP range permitted to access the ASA’s internal IP.

Before downloading, ensure your ASA 5505 is configured to allow web-based management: