I have downloaded a custom indicator and it is not compiling in mt5. It has close to 100 errors.

 
  1. That's not MT5. MT4 has IndicatorCounted(), High[], Low[], Open[], and Close[].

  2. Ian55: I am not familiar with coding. Anyone who can help me to rectify the errors?
    Help you with what? You haven't stated a problem, you stated a want. Show us your attempt (using the CODE button) and state the nature of your problem.
              No free help

  3. MT5: Begin learning to code it. If you don't learn MQL4/5, there is no common language for us to communicate. If we tell you what you need, you can't code it. If we give you the code, you don't know how to integrate it into yours.

    or pay (Freelance) someone to code it.
              Hiring to write script - General - MQL5 programming forum