The Battle Royale is meant to be a way to expose players to the new edition of Shadowrun, so it's a good thing to cut your teeth on. Both as players, and as GM getting familiar with the rules.
There's only one mission published in the new edition's rules, called Free Seattle. You can find it on the CGL store and on DTRPG. Once you get more familiar with 6we, you'll find that converting missions written for 5e and even 4e aren't too hard to convert to the modern rules.
Additionally, the Catalyst Demo Team has access to the Shadowrun Missions that aren't yet available for purchase. If you want to become an o-fficial Shadowrun demo agent, you'll get access to them! Of course, that's not everyone's cup of tea... no clue what's holding up the rest of season 8's missions but when seasons 9 and 10 are available for sale, they'll be dual-statted for both 5th and 6th world editions.