I don't know if you fixed the problem with updating extras, but anyway.
Super Dune II Classic has been updated to v1.5. The update includes the latest fixes, such as the
IX remap bug fix,
digitized sound effects fix,
glowing selection boxes for the new sides and
fixed heralds in the production/starport screen. I've also figured out how to skip the Atreides ending (which plays for all "new" sides) but keep the game credits playing after the final mission. With this done, the credits text is now for both Super Dune 2 and the original Dune II. The Fremen are now much more resistant to deviation than in the previous releases, to balance issues with the first Fremen mission. To compensate for the fact that the Mercenaries and the Sardaukar no longer have restricted concrete slab placement, the "decay" damage received by these sides has been increased somewhat.
Download Super Dune II Classic v1.5
IMPORTANT NOTE: The modification is now designed for a stand-alone installation, and installing it into the Dune II directory is
not recommended. Please refer to the supplied readme file for installation instructions.