If you prefer a secure, legal version with official updates and DLC access:
Hold the R button while launching any installed game/app on your Switch to enter the Homebrew Menu in full RAM mode. Open the Installer: Pic-a-Pix Deluxe Switch NSP Free Download
Navigate to File Browser > sdmc:/ and select your NSP to install. If you prefer a secure, legal version with
Open NS-USBloader on your PC and drag the Pic-a-Pix Deluxe NSP into the window. If you prefer a secure
You can purchase and download it directly from the Nintendo eShop .