About Flow Installs
These installs are upgrade compatible. You generally do not need to uninstall the previous version before applying a new version. (some exceptions apply and are noted in the release notes.)
The latest installer will bring you up to the latest. You do not need to apply each consecutive patch as the latest will always apply all intermediate patches.
All your data is generally preserved during update. It is recommended however to make a backup of your database before proceeding with a Flow install.
Flow updates will not cause an interruption to the players. You should apply Flow updates at off peak hours however since Flow users will have their sessions terminated during the update process which may lead to loss of any unsaved changes they had at the time.