Hi @decwodie,
Any plugins installed on sites before the free license changes in late 2022 will have a key generated automatically by Wordfence, which would continue to work as long as that is live. However, new installations will require the following process (there’s a video in addition to text instructions): https://www.wordfence.com/help/api-key/#installing-your-free-license-key
There’s no limit to the amount of free sites a single email address can register, so if you have multiple sites to manage, you won’t be restricted in any way from getting the plugin set up.
Thanks,
Peter.