Although, of course, you do not download from maemo.org. Clicking through Downloads and OS images -> N800 (in the right sidebar) redirects you eventually to http://tablets-dev.nokia.com/nokia_N800.php, whence you may download RX-34_DIABLO_4.2008.23-14_PR_COMBINED_MR0_ARM.bin which, as might be inferred from the name, does feature the Diablo updates. The (Windows-only) wizard is not required.