Cisco regularly updates software. While this post reflects the standard process for Cisco ASDM 7.18(1), always check Cisco.com for the absolute latest version or patch updates.

: Due to Oracle's end-of-support for JRE 8 and the JNLP protocol, ASDM 7.18 no longer allows launching directly through a browser using Java Web Start. Mandatory ASDM Launcher : Users must now download and install the ASDM Launcher