Is it different from AdGuard for Mac?

Yes, these are two different products:
· AdGuard for Mac is a full-featured desktop application that provides system-wide ad and tracker blocking across all browsers and apps on your Mac.
· AdGuard Mini for Mac is an extension that works exclusively within the Safari browser.
Downloading AdGuard To install AdGuard, click the file indicated by the arrow Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, drag the AdGuard icon to the "Applications" folder. Thank you for choosing AdGuard! Select "Open" and click "OK", then wait for the file to be downloaded. In the opened window, click "Install". Thank you for choosing AdGuard!
Install AdGuard on your mobile device