If you've been using ApkPure to update Japanese version of Love Live! on mobile like I do, I have some bad news for you: ApkPure has stopped working with LL. First it was SIFAS about 2 weeks ago. I tried all I could but it still told me to update Google Play, even though I have the newest version of it installed. Today it's SIF's turn. Apparently ApkPure now will only download an outdated version of both games, so you can never actually update.
There are good news though: QooApp is working again with both games. I originally abandoned it and switched to ApkPure since it stopped working when Klab switched to XAPK format for their games, and now the table has turned. If you are having issues updating LL, just download QooApp and use it to update your games, and keep your finger crossed when the situation changes again. Happy playing and bye!
Link to grab QooApp: https://apps.qoo-app.com/en/app/880