To install as a CIA file on your Nintendo 3DS, you will need a console with custom firmware (CFW) and the FBI homebrew application . Installation Steps
: Reinsert the SD card into your 3DS, power it on, and open the FBI application from your HOME Menu. Heroes Of Ruin 3DS (EUR) CIA
: Navigate to SD -> CIA (or your chosen folder), select the file, and choose "Install and delete CIA" to save space. To install as a CIA file on your
: Copy the Heroes of Ruin (EUR) CIA file from your computer into that folder on the SD card. power it on