Hi @copacetic, welcome to DevKinsta!
So far I haven’t seen anyone else having this issue with DevKinsta 2.7.0. Are you getting it from this download link: https://kinsta.com/devkinsta/download/?version=mac
Can you check if this is what is happening? https://www.howtogeek.com/803598/app-is-damaged-and-cant-be-opened/
Perhaps the file is getting quarantined.