The error code 0xC86044D2 is a known status code within the Nintendo 3DS homebrew community, specifically occurring in the FBI (File Browser Interface)
Ctrl + F5 (Windows) or Cmd + Shift + R (Mac) on your browser. Clear the cache for the specific dApp page.Many users encounter this error even when their SD card appears to have enough space for the file they are installing. This is because of how the installation process works: 0xc86044d2 fixed