If this prompt is dismissed without enabling, you can manually enable the Safari extension: When prompted, click Open Safari to enable the LastPass for Safari extension.

In the LastPass Safari extension app window, enter your username and Master Password, then click Log In.Open the Applications folder, then double-click on the LastPass app and click Open.If you had installed a previous version of the Safari app extension and are prompted that the LastPass.app already exists in the Applications folder, click Replace.

Click and drag the LastPass app icon to the Applications folder.

Locate the download, then double-click on the LastPass.dmg file to open.

Download the LastPass Safari app extension.

Please note that the Safari Legacy extension will continue to function on Mac OS X 10.11 (El Capitan) or earlier, however, that extension will no longer receive updates due to Apple restrictions. The Safari app extension is supported on macOS 10.12 (Sierra) or later. Enable 2FA with LastPass for ultimate security! AutoFill by LastPass is designed to autocomplete forms fields with your logins and passwords, credit card information, address, and more on Apple Safari. Using a Password manager with Apple Safari stores and organizes your logins and passwords securely, and saves you time with features like Autofill. HELP FILE How do I install the LastPass for Safari app extension on my Mac?

Lastpass download for safari