Yes. OpenFusion preserves playable Original/Future and Academy builds, while community projects such as Retrobution provide another current way to download and play the game.
Use the FusionFall.org community download hub to find the current launcher, files and version guidance. Choose Original/Future, Academy or Retrobution, verify the named project source, then install or extract the client into its own folder.
Use the current FusionFall.org download path for OpenFusion launcher guidance and help choosing the right Windows, macOS or Linux option. Release numbers can change, so verify the named project and filename before installing.
Install the current OpenFusion launcher, then follow the Retrobution community instructions to add its separate server and register an account.
Community servers use separate account databases, so players generally need to register a new account for the server they select.