You can install it via the Package Manager via the first option (Installer) of the Extras menus.
If you are using HTML5 - I would recommend not using it. It does not understand "data-" section aside, etc. In my experience it will trash those pages nicely.
Thank you for responding... what would you recommend for an editor then?
I do everything via Zend and paste it in.
This may help you, but I do not believe it handles all of the issues I mentioned. At least it didn't a month ago as my wife likes TinyMCE and trashed to pages on a fresh install of Revolution and TinyMCE.
Try it and see if it will work for you.
The new beta of the latest TinyMCE may be better, although it does still have some features missing.
[ed. note: sottwell last edited this post 4 years ago.]