Then it won't work.
First, to download a game from the eshop you have to buy it or install a legit cia of the game (if it has one) from your own region.
And if you install a non legit cia, it will install a false ticket in your sysnand/emunand (depending on where you installed it) and will prevent you from downloading the game/update (even if you want to buy it).
Ex :
https://gbatemp.net/threads/ntr-fw-sproofing-fails-to-download-updates-sysnand.389108/
The only way to solve this is to restore the nand/emunand backup you made before installing the cia.