Install fails on High Sierra


New Member
As a licensed user, I'm trying to install on a secondary Mac running High Sierra. The installation completes, but when Adguard reaches the stage where it wants to install the system extension, I select 'Open system preferences' and despite having unlocked, clicking the 'Allow' button does nothing.

I've tried removing and reinstalling, but the Adguard dialog prompting for permission will not go away.

Is there any workaround available?