Download old version of firewall

Hi,

what do you need an old version for, you can download two current versions?

Ian

i need to do some security research on a vulnerability that exploited last year 

Hello Nick Chen ,

Thank you for reaching out to the community, you can download the desired old version from here: 
1.) For Hardware appliances - https://download.sophos.com/firmware/HW/index.html
2.) For Software appliances - https://download.sophos.com/firmware/SW/index.html
3.) For Virtual appliances - https://download.sophos.com/firmware/VM/index.html

the download link only contain .sig file how do I download for example a virtual machine image from there

Hey Nick Chen ,
You can find the ISO in the links below:

SFOS Installers - https://download.sophos.com/network/SophosFirewall/installers/index.html