There is no functionality to mass migrate your entire install like that. We only provide user import/export in latest CB 2.x releases, but you won't be able to use that to export your CB 1.x users and will likely need to use CB Juice. Your alternative is to dig into the database and do direct database migrations, but since you've 2 vastly different CB versions that is unlikely to work unless you first update the CB 1.x install to CB 2.x.

Thanks for your quick response. Is there an upgrade path for CB from v1.9.1 to the latest v2.4.2?

Basically install latest CB 2.x and review your entire installs configuration to ensure it's still working as expected. A lot has changed since CB 1.x so some parameters have moved, been removed, or have changed. Some migration attempts fail, but it's rare (e.g. some users reported losing some userlist parameters, but is uncommon).