What do I need to install/download before start trading FX?

Based on the device you are using PC/mobile you should choose the right platform for you by visiting the website, Platforms section.

The trading platforms can be downloaded via the official websites.

FBS offers MT4 and MT5 trading platforms, thus you may download both/either of them or login to web-based trading platform where you can start trading without installing/downloading anything.

You can login to multiple accounts using only one trading platform. So unless you prefer for some reason, there is no need to download several trading platforms to your device.