Looks like only latest 3 Simulator Images are available -9.7,9.6 & 9.5. NetApp site has been upgraded recently, so the old link now automatically re-directs to the new tools url, but I am not sure if it's possible to access old URL.
Anyway, any reason for Ontap 9.4 Simulator ? Are you trying to test any scenario specific to Ontap 9.4 ?
thank you for the reply. i have ontap 9.4 in production, i have to check some API integration with open source Grafana for monitoring of storage & servers. I have done with server part integration. now looking for storage. and i don't have seprate admininistration in production and also don't have virtual environement too.