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I don't remember having such difficulty before and even watching youtube videos of the same missions I am doing seem to be waaaaaaaaaaaaaaay easier than what I am going through. For example; I'll play a mission and when I encounter the enemy hero they ALWAYS have a very large posse of troops with them, yet when I watch the youtube version from start to finish and they first encounter the enemy hero they only have maybe one or two troops with them.

Same mission, same game, same hero encounter but FAR different result.

Is this version harder than the CD version?
No. They are exactly the same. Nobody could change game because source code is lost.