Client 7.6004 is now out, for changes check the Patch Notes.
Any existing mxoemu install of the MxO client will update automatically.

New installs should extract MxO_7.6004p.zip to a user-writable folder and run launcher.exe, the rest of the client data will download after you log in.(Alternatively, you can download the entire client for this version here: MxO_7.6004.7z, 7-zip required to extract)

If you have a pre-mxoemu MxO install already and want to re-use it, extract 7.6004p_patcher.zip to it's directory, making sure to overwrite the DLLs when asked, then run launcher.exe which will update it to the current version.