Hi, we've just downgraded from a Families account back to the free account, as the full range of services was no longer needed, and only one user account was now needed.
The Lastpass website states, paraphrasing: 'shared folders will no longer be shared, but passwords will remain in your vault'.
However, almost all the passwords have disappeared, and are not in deleted items either.
This is logging in directly to the dropbox website, not a browser extension or app.
And apparently there is no come back because there is no support available to free users.