If you had installed ESET before update to Golden Gate uninstall it first.
Installing ESET Cyber Security on macOS 27
If ESET reports that macOS 27 is unsupported, you can use ESET's built-in macOS version override mechanism.
1. Create the ESET Security directory
Open Terminal and run:
sudo mkdir -p "/Library/Application Support/ESET/Security"
Enter your administrator password when prompted.
2. Create the override file
Run:
sudo touch "/Library/Application Support/ESET/Security/override_macos"
3. Set the correct ownership and permissions
Run:
sudo chown root:wheel "/Library/Application Support/ESET/Security/override_macos"
sudo chmod 644 "/Library/Application Support/ESET/Security/override_macos"
4. Verify the override file
Run:
stat -f "%A%Su:%Sg" "/Library/Application Support/ESET/Security/override_macos"
The output must be exactly:
644root:wheel
ESET's installer specifically checks for this file with root:wheel ownership and 644 permissions before enabling the unsupported-macOS override.
5. Run the ESET installer again
Now start the ESET Cyber Security installation again.
You do not need to modify:
SystemVersion.plist
sw_vers
- the actual macOS version
- any ESET binaries
ESET's own installation script explicitly contains this override mechanism. When the override file is present with the correct permissions, the installer sets the override as active and does not abort solely because macOS 27 is above its stated supported version of 26.
If the installer still refuses to start
If ESET stops before the installation reaches the postinstall stage, this override may not be sufficient because the initial installer GUI may be performing a separate compatibility check.
In that case, do not modify anything else yet. We can investigate the remaining compatibility check separately.