ARK is a notorious storage hog. With two major DLCs and the base game, ensure you have at least 30GB+ of free space on your SD card.
When you're dealing with "NSP rar" files for the Switch, keep a few things in mind to ensure a smooth installation: ARK is a notorious storage hog
Ensure your custom firmware (CFW) is updated with the latest sigpatches, or the console might refuse to launch the "unassigned" content. ARK is a notorious storage hog