Somehow this went unnoticed, but you can actually do this now. This will let you play games such as Project Zero that did not get an eShop release depending on your region.
1) Download and extract the new DiscU: https://twitter.com/crediar/status/791775642949914624
2) Run DiscU.exe path\to\game.key path\to\game.wud c
3) After it's done extracting, go into the folder that was just generated (WUP-P-AL5P in my case) and find the first "GM" folder which holds the game data. Proceed to copy all the files in this directory to your SD card in the SD:\Install folder.
4) Go up one directory and enter the system\02 folder. Copy the title.tik, title.tmd and title.cert files in the SD:\Install folder as well.
5) Proceed to install it like you would with eShop releases. I recommend https://gbatemp.net/threads/wupinstaller-y-mod-with-mulitple-install-folders.445907/
Have fun
1) Download and extract the new DiscU: https://twitter.com/crediar/status/791775642949914624
2) Run DiscU.exe path\to\game.key path\to\game.wud c
3) After it's done extracting, go into the folder that was just generated (WUP-P-AL5P in my case) and find the first "GM" folder which holds the game data. Proceed to copy all the files in this directory to your SD card in the SD:\Install folder.
4) Go up one directory and enter the system\02 folder. Copy the title.tik, title.tmd and title.cert files in the SD:\Install folder as well.
5) Proceed to install it like you would with eShop releases. I recommend https://gbatemp.net/threads/wupinstaller-y-mod-with-mulitple-install-folders.445907/
Have fun