How do I open a Numbers document sent from a Monterey MacBook Air on my Ventura 13.7.8 MacBook Pro?

> The version of numbers I have is 4.3 (5046)

Numbers 4.3? Are you sure about that?

The current version of Numbers is 15.4

Numbers 4.3 would date back to about 2017. Not entirely reasonable to expect an almost 10-year old application to open such a document.

So I'd start by looking to update the version of Numbers installed on your Ventura machine. Start at the App Store and see if there's a newer version available for your OS version (unfortunately, even Ventura is considered old at this point, and support for older versions certainly wanes over time).

Failing that, the web version of Numbers (available via hthttps://iCloud.com/ would be an alternative, but getting a native version of Numbers will help you more in the long run.

Try to move the Numbers file to iCloud Drive and open it from Numbers on iCloud.com using a web browser.

Your version of Numbers (if it actually is v4.3) is woefully outdated. The current version (15.4) of Numbers in the Mac App Store requires macOS 26.0 (Tahoe) or newer.

You can get the last compatible version (13.2) of Numbers on macOS Ventura, if and only if you previously installed Numbers using the same Apple ID previously used to install it. If Numbers was pre-installed by Apple or a third-party reseller, you can only use Numbers for iCloud now.

If the first sentence of the last paragraph is true, then do the following:

1. Launch the Mac App Store and sign-in with that same Apple ID
2. Press cmd+0 (zero) to open the Purchased panel
   1. Locate Pages and click its download symbology
   2. You may receive one or more dialogs. Don't click Cancel, and the final dialog will ask if you want to install the last compatible version of Numbers for Ventura. You know that answer.
3. Quit the Mac App Store after installation of Numbers is complete

Now, you should have no issue opening that recently received Numbers spreadsheet.

Which versions of Numbers are installed in each?