Since the app is not on the Google Play Store, you must install it manually.
AetherSX2 is legal software. However, downloading PS2 BIOS files or game ISOs that you do not own is piracy. To stay within legal boundaries, dump the BIOS from your own PS2 console and rip your own game discs. aether sx2
You cannot use physical PS2 discs directly. You must use disc images. Since the app is not on the Google