Sorry – 4.04 was produced to deal with some of our internal production and test issues. It is functionally the same as 4.01.
In general, we do not believe that non-beneficial upgrades help our users. Every upgrade takes time, has a small but real risk of breaking something, and can cause confusion among both our users and our support staff. So, if you really need 4.04, you'll have to buy a new Eclipse. Sorry.