This is often a macOS security error. Use the Terminal command sudo xattr -cr [path to app] to clear the extended attributes.
, often fail to work in non-official versions because they require a live connection to Adobe's servers. Recommended Troubleshooting for Illustrator 28.6 illustrator 286 monter groupdmg verified
Always scan DMG files with updated antivirus software. This is often a macOS security error