Personally I prefer to use self-hosted version of TinyMCE and it can be downloaded at https://www.tiny.cloud/get-tiny/self-hosted/
In order to use TinyMCE self-hosted version, you need to download the latest version of TinyMCE package. It can be downloaded at https://www.tiny.cloud/get-tiny/self-hosted/. In my case I just upload all the files to /js
<script src="http://tinymce.cachefly.net/4.1/tinymce.min.js"></script>
<script>
tinymce.init({
mode : "textareas",
theme: "modern",
add_unload_trigger: false,
autosave_ask_before_unload: false,
menubar: false,
toolbar_items_size: 'small',
force_br_newlines : true,
forced_root_block : ""
});
</script>
<textarea width=60 height=20>Write something</textarea>