Application is damaged and needs to be reinstalled

Hey, I got this problem for some apps (mostly older ones) that I downloaded from store when setting up my Mojave.
I noticed in a video (fixing iMessage) where a guy told:
Please watch out if your network card is en0 - if not it will not work.

So going System report and showing up Ethernet Cards, I noticed my one is indeed en1.

How to fix it?
made a copy of:
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

and modified it (in my case bluetooth was en0 and I simply switched...

Application is damaged and needs to be reinstalled