How to install AdGuard on macOS High Sierra and above
This article is about AdGuard for Mac, a multifunctional ad blocker that protects your device at the system level. To see how it works, download the AdGuard app
During the installation of AdGuard on macOS High Sierra (or later), you may receive the message "System Extension Blocked". This is a new security mechanism introduced in High Sierra that requires you to explicitly allow the installation of a third-party system extension.
To complete the installation of AdGuard you have to manually allow loading the extension by clicking the "Allow" button in System Preferences → Security & Privacy → General.
On macOS Sequoia, you can do it in System Preferences → Security & Privacy → General → Login Items & Extensions. Once there, click the "i" icon next to Network Extensions and toggle the AdGuard option.
After that you will be able to proceed with the installation as usual.