Nikon Japan has announced that the installation files for ViewNX 2, ViewNX-i, Capture NX2 and Capture NX-D will no longer be available to download as of June 30th, 2022. They instead suggest that users download the latest version of NX Studio. Fortunately, NX Studio is free, so you’re not left completely in the lurch, but if you’ve been using Nikon’s old software, you should probably update.
The removal of access to the downloads seems to be just a formality as the Nikon UK website already lists all four apps as being discontinued. And while Nikon UK lists them all as discontinued, the files are still currently available for download. Probably not for long, though, as it appears the removal will be global. Nikon Europe also made a similar statement with regard to removing downloads.