Unfortunately, it is not possible to use many of the indicators we offer on our website because we do not provide the source code for products that are licensed or copyrighted, this is a limitation of the cTrader trading platform as you need to source code of the indicator to be able to reference it in your cBot project.
Some of our indicators do have an interface (API) that you can use in your automated trading system projects, you will find these in the trading API plugins page.
If the indicator you wish to use is not there then your options are to search the internet for a similar product that you can download which includes the source code or post a suggestion on our forum for us to add an API.