For deploying files safely onto a physical Switch console running Custom Firmware, the industry standard is utilizing or Tinfoil via an internal SD card directory or USB-C MTP transfer.
Ensure your base game file ( Groove Coaster Wai Wai Party [v0].nsp ) and your chosen update file ( nspupdate 1 or the latest build bundle) are located in an accessible folder on your PC. groove coaster wai wai party nspupdate 1 install
If you prefer Goldleaf, be warned it is picky about sigpatches. For deploying files safely onto a physical Switch