Ugh... This is the toughest indicator code that I have ever converted. Each version has worked in the IDE debugger but a few ticks arrived last night in my demo platform showing errors again. I had to reorganize the MQL4 code's compound nested code blocks and then compare my MQL5 code to it element by element again and fix nested code. In this version 4, the arrows look ok but the NRP zigzag line has a distorted point in history and runs into the future. Unfortunately, I can't test while the market is closed during the holiday. I'll retest it later this week.

Merry Christmas and Happy Holidays.