I don't want to sound rude, but did you attempt to search "Macos app is damaged issue fix"..
This is a very common issue with Macos in general and unsigned software. I don't own a Mac nor an apple developer account to sign Remix.
Please, next time do your research first before reaching out. I am a very busy person and questions like that.. that could be simply fixed by very common sense of doing a quick google search really don't contribute anything meaningful to anything. I know this sounds super rude/ mean to say, but this isn't the first time a Macos user reaches out to me (someone who doesn't even own a Mac) to fix something like that..
App is Damaged fix
Apologies.... this was the first time I've ever encountered an error like that on my Mac, and I've had it and downloaded many programs off the internet for 10+ years, so I didn't even think it could be a universal issue... I am sorry for bothering you. I appreciate the help you've given us. Thank you.