I haven't checked if everything works, so use at your own risk
EDIT:
Thanks to the help of a mysterious contributor via DM, I can share a link to the original version, which is located inside the zip file in this post
post1295524067.html#p1295524067
XARD: The RSI MA1 MT5 indicator was actually ported from MT4 original RSI MA1 indicator
Just look through the site and you will come across it