How to update from 1Password 7 to 1Password 8 on a Mac running Ventura?

their website says it requires macOS 12 or newer to run their latest version

Download 1Password for Mac | 1Password

if it was me then I would just download and install that

As Rudegar has mentioned, 1Password 8 requires macOS Monterey (12.0) or later, so it will run on macOS Ventura (13.0) without issues. However, note that 1Password 8 is a subscription-based version, meaning it requires a 1Password account to use.

If you're using an older version of macOS and still need a password manager, 1Password 7 would be the last version that supports macOS 10.13 High Sierra and later (though it's no longer actively developed).

MacOS 12 is macOS Montere

MacOS 13 is macOS Ventura

so what your computer is running is newer than the minimum requirements stated by the developers of 1password

so downloading their latest version should be perfectly compatible with the operating system of your computer

You will have to pay for 1Password 8 as follows;

Apple has two free password apps you can use, KeyChain and Passwords. Both are in the Applications folder.