Currently, op update downloads an update if available but does not install the update itself. There should be an option to install the update after download.

Also, in the current download update model, some text letting the user know that they need to run the .pkg file to install the update would be helpful.

```
❯ op update
1Password command-line tool 2.0.0-beta.11.

Version 2.0.0-beta.12 is now available.
Release notes: https://app-updates.agilebits.com/product_history/CLI2

Download the update to /Users/manojkarthick/Downloads? [Y/n] Y

Download complete: /Users/manojkarthick/Downloads/op_apple_universal_v2.0.0-beta.12.pkg

op update does not install the update. You can install the update by running the package file present at the path above.

```

---

1Password Version: 2.0.0-beta.12
Extension Version: Not Provided
OS Version: macOS 12.0.1 21A559 arm64