Screenflow can't open

Hi everyone,

After I updated my iMac to macOS Sierra I couldn't open the program 'Screenflow' anymore. It's a program what I bought for 100 euros so I really want it to work. Does anyone has any ideas how to open it?

This is how it looks like. When I open it it says: 'To use ScreenFlow you need to update your software to the newest version.