// Compare with the target version (10.15.7) let targetVersion = "10.15.7" if currentVersion == "macOS \(targetVersion)" print("You are running macOS Catalina 10.15.7") else print("Your macOS version does not match 10.15.7")
If you want to install Catalina on multiple Macs or do a clean install: download catalina 10.15.7
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume // Compare with the target version (10
| Issue | Fix | |-------|-----| | "This copy is damaged" (date error) | Open Terminal and run: date 0101010116 (temporarily sets date back) before launching installer. | | Installer quits after download | Check your Applications folder – it may have saved there already. | | Not enough free space | You need ~20 GB free. Catalina installer is ~8 GB, but installation requires ~12-15 GB more. | Catalina installer is ~8 GB, but installation requires
// Function to get the current macOS version func getMacOSVersion() -> String let osVersion = ProcessInfo.processInfo.operatingSystemVersion return "macOS \(osVersion.majorVersion).\(osVersion.minorVersion).\(osVersion.patchVersion)"
If you need to do a clean install or downgrade, once the installer is downloaded, plug in your USB drive (named "MyVolume") and use the following terminal command: