On this page, you will find all there is to know about the Software updates for Link-a-Pix Colour on Nintendo 3DS (originally released on January 18th 2018 in Europe and North America, and February 28th 2018 in Japan).
How to download updates for Link-a-Pix Colour on Nintendo 3DS?
To download updates for this game manually, you can choose one the following options
while connected to the internet, launch the game from the Home Menu. You should get a prompt when doing so: simply follow the instructions displayed on the screen;
go to the Nintendo eShop, and search for Link-a-Pix Colour. Select the update, and download it;
use the option on the Nintendo eShop settings page.