To understand the significance of version 1.5, we must first break down the terminology.

If you inherit a network with a pre-installed old version, run antivirus and checksum verification (MD5/SHA1) against Cisco's published hashes.

Navigate to "Software Downloads" → "Security" → "Adaptive Security Appliance (ASA)" → "ASDM" → select your ASA model and version. Look for files named asdm-idm-launcher-v1.5.zip or similar. You will need a Cisco login with active entitlements.