Converting mql4 to mql5

 
Can i use some sort of include files that would allow me to code like im in mql4 using mql5? Is this even possible?
 
And what is wrong with mql5? it seems like a downgraded version of mql4, doing the same tasks is much more complex in mql5
 

mql4 and mql5 are the different programming language for different trading platforms: MT4 and MT5.
There are some tools (CodeBase) and the articles about how to create cross-platform indicators and EAs (such as "MT45" EAs/indicators).

  1. Articles to create MT45 tools. There are cross-platform codes so you can look at the articles related to the following: how to create cross-platform EAs and indicators.
    Many articles are here on this search results links (I will not post them all here as there are many aricles and series of the articles related to it).
  2. CodeBase with tools for MT45. Some tools in Codebase which will help to create cross-platform EAs and indicators - this search results links.
    Example: This is a cross-platform МТ45 Expert Advisor - expert for MetaTrader 5