I have dl’d and unzipped Plex Media Server and when I try to run it, it says it’s damaged and I need to trash it. I’ve deleted it and redownloaded it several times with the same result. I’m running an iMac 21.5 2014 with Big Sur 11.6.5 Thanks for any help.
What are your steps after you have unzipped it. Are you opening the app directly from the download folder?
Make sure you drag and drop the server app into the Applications folder. Open Plex server from there inside the Apps folder. It should prompt you to open it.
If you have to, reboot the Mac, and try again. It could be something system related that’s not Plex’s fault.