This is usually a macOS security feature. You can often fix this by opening Terminal and typing sudo xattr -rd com.apple.quarantine /Applications/Adobe\ Illustrator\ CC\ 2018/Adobe\ Illustrator.app .
Once the progress bar reaches 100%, close the installer. Do not launch the app yet. 4. Important Safety & Compatibility Warnings adobe-illustrator-cc-2018-v22-1-0-312-macosx-2-2gb-2022
Files labeled with long strings of version numbers (like v22-1-0-312 ) from unofficial sources can sometimes contain malware or "cracks" that compromise your system security. Always run a virus scan on the .dmg before opening it. This is usually a macOS security feature
Adobe officially supports the current version and two previous versions. Using 2018 means you will not have access to modern features like Cloud Documents, improved Puppet Warp, or updated SVG exports. 5. Troubleshooting Common Issues improved Puppet Warp