Help Center - Little Snitch - After installing on macOS High Sierra I get the message: “System Extension Blocked”

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After installing on macOS High Sierra I get the message: “System Extension Blocked”

Please visit our High Sierra Compatibility page for information about installing and running Little Snitch 4 on macOS High Sierra.

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Help for Little Snitch

After installing on macOS High Sierra I get the message: “System Extension Blocked”