I've taken note of the key phrase 'LastPass Password Manager 4.121.0 download the last version for mac' and extracted relevant information from the text.

It appears that LastPass is a password manager that allows you to securely store usernames and passwords across multiple devices and platforms. Here are some key features:

1. Automatic filling: LastPass can fill in saved logins and forms with the click of a button.

2. Syncing: Your data is synced across any computer or mobile device you use regularly.

3. Encryption: Passwords are stored in an encrypted vault, ensuring secure access.

4. Autofill: LastPass can autofill usernames and passwords in apps and websites.

To get started with LastPass:

1. Download the extension for your browser.

2. Follow these steps to begin using our free password manager:

* Install the LastPass browser extension.

* Once installed, a button will appear in your browser's toolbar.

3. Store usernames and passwords securely in your encrypted vault.

To download the latest version of LastPass for Mac:

1. Go to the official LastPass website.

2. Click on 'Download' and select the macOS option.

3. Choose the correct version (4.121.0) and follow the installation instructions.

If you need further assistance or have any questions, feel free to ask!