The 10.4.3 "Premium" version typically unlocks features that Smule usually hides behind a paywall:
While a Mod APK is a tempting way to skip the subscription cost, it’s a "use at your own risk" situation. If you have a lot of heart and soul poured into your Smule profile, you might want to stick to the official app to keep your recordings safe.
You won’t get official updates from the Play Store. If Smule changes their server settings, the mod might stop working until you find a newer version. The Bottom Line
Smule’s systems can sometimes detect "unofficial" clients. If they catch you using a mod, your account (and all your recordings) could be permanently banned.
If you just want to mess around for an afternoon, make sure you download from a and scan the file with a mobile antivirus first.