Fluorine is being rewritten to be an actual desktop instead of a collection of programs and bash scripts so things may break.
As a daily driver it'll probably be fine though as long as you don't update if everything's fine.
On Arch run bash <(curl -s https://fluorine.sh/install)
On Manjaro it should be fine but proceed with caution.
To update (which is basically a guessing game of if something will break or not): bash <(curl -s https://fluorine.sh/update)