Welcome to the past! 👻
Unfortunately, FCKeditor is no longer maintained. RIP ❤️
Or, you can discover CKEditor 4, which is an enterprise-grade WYSIWYG editor with countless features and wide browser compatibility including the legacy ones.
The 2.6 development has been concluded. After the beta, this version comes to stabilize the new dialog system, as well as fix several issues.
We'll be waiting for a while to catch some feedback about this release, and hopefully the final 2.6 will become public soon, having the same code base as this Release Candidate.