ESPHome-flasher on iMac

Hello,

I try to open ESPHome-flasher on my iMac, but I get the message:ESPHome-Flasher.app can’t be openend. I tried to change the permission for the file, but it doesn’t work. It keep telling me that I can’t open the app.
I hope somebody knows the solution how I can use the app anyway.
Thank you.
Yvonne