Hi, James,
I would start by selecting a broker you wish to use, follow the link below for our list of recommended brokers.
https://clickalgo.com/ctrader-brokers
When you sign up with a demo or live account with your broker they will provide a link to download cTrader, if you install a new version of cTrader you will need to load your cBot settings back, you can do this by first saving your settings and loading them at a letter time.