I think you have to have the ex4 file and another one called mql4 to be able to make the bot and when I download mql5 indicators it only downloads the ex4. What is the use of one file and another?
The mql4 file is editable source code that can be viewed/edited in MetaEditor.
ex4 files are executable files compiled from the mql4 files and the compiled source code is not viewable/editable in MetaEditor.
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I’m not good at MQL5 but I think it’s quite outdated to use it for creating robots. These days, lots of companies created more modern platforms where anyone, even a total noob can uunderstand how to create indicators and how to runn trading robots, moreover, most verisons offer free trials. It’s a good way to learn something new about algorithmic trading rather than trying to sort out how an old app works and look at inconvenienced charts on the mql5.