Go to your AA2 root directory. Open: /data/save/
If you install a card and the character is invisible, naked, or the game crashes, the card is likely a .aac file that needs "decryption." artificial academy 2 how to install cards
If you have just downloaded a massive folder of .png or .aac files from a Japanese BBS or a Discord server, you are likely staring at your screen asking one question: Go to your AA2 root directory