john

ok thanks, I´ll try that when the next update comes through.

ok thanks Daniel , solution was to trust there is no malware associated with the app. cheers

ps I have opened previous versions without a problem, e.g. DWSIM_v643_macOS

Thanks Daniel. Unfortunately when I attempt to open the file after downloading, I get the same error message.

I get the subject message when trying to open DWSIM 6.4.4.dmg on my macOS Big Sur v 11.2.1. Any comments would be appreciated. Thanks