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Once the anti-virus is installed, a notification will appear, saying "Your permission is required to scan the file system":
The notification will appear after each device restart, and hourly thereafter, if ignored.
To grant permission for the scan, you should:
In case the notifications were ignored, the Allow access button is added to the "General" settings section:
After clicking on this button, proceed as described above.
A special case when there is a drive access permission issue — the SpIDer Guard component is not activated on macOS Ventura. In this case: