This means:
Cisco Secure ACS 5.5 is currently and obsolete , meaning the ISO is no longer available for official download from the Cisco website . Cisco's policy for retired security products involves removing documentation and downloads to prevent the use of software that is highly susceptible to security vulnerabilities. Key Status Updates (April 2026) cisco acs 55 iso download updated
: Cisco has removed the ISO for ACS 5.5 from its standard download center because the product is beyond its lifecycle . This means: Cisco Secure ACS 5