I am using tinyMCE version 3..
The reason I haven't upgraded. when I have installed version 5 and imported tinymce.min.js. It was looking for themes.min.js in the console and was not working. I have have same version and worked on.. Now in every browser it works but in IE the below content is not being displayed. WHen I debug it actually executes this line of code in the bottom but not in IE and its displaying only when I do shift+insert or CTL+V and I also found out that the paste CTL+V doesn't work as expected in this tinymce but its working in other browsers.
$(tinyMCE.activeEditor.getContainer()).find("#" + editor.id + "_path_row").html("Remaining characters: " + (value));
for the above line code I guess the active editor is not working. for this IE browser is there any other alternative I can use.