If you are managing a Cisco ASA 5505,
To check your ASA version via CLI: show version | include Version cisco asa 5505 asdm-idm launcher download
For the ASA 5505, the last stable release is ASDM 7.12(1) or 7.8(2) depending on your ASA code. We recommend: If you are managing a Cisco ASA 5505,
Let us assume you have the legitimate asdm-launcher-win64-7.12.1.msi . cisco asa 5505 asdm-idm launcher download