Hello,
I'm an experienced (MT4 / MT5 / MQL/ C / C++ / C#/VBA ...) Coder and Forex Trader. I mainly focus on coding/developing Indicator/EAs for trading. I was on the Market more than 6 years.
First of all, to modify, the EX4 need to be converted to MQ4 file first. After that, this Indicator can be turn to Expert Advisor (EA).
I decompiled many EX4 files here, and I would like to check your EX4 file first to see which type of protection.
A bid of $150 is an Estimation only. We need discuss further to specify the Cost and Delivery Time.
Regards!.