“Instance” is a object which is used as a technical indicator in cTrader.
There are some differences between MT4 and cTrader and “Technical Indicator” refers as “Instance” and “EA” refers as “cBots”(or instance).
There is no limitation to the number of instances you can run at the same time.
You can find technical indicators in cTrader as below.
You can find the list of cTrader account types in the page below.