From the Full Product Download page, Enter "12.0.1.mp04" (including the quotes) in the Search box to see a list of links to the release letter and the release package.
Alternatively, the release package can be found using the file navigator by selecting 'NX' from the menu on the left of the page and then expanding the following folders: Product updates > Maintenance-packs > Nx12 > Windows (64-bit).
Sincerely,
Siemens Product Lifecycle Management Software Inc. Digital Factory Division SFB-NX-8002483 Product Information: