There is no official v1.6.0 update for the original Cardfight!! Vanguard Dear Days
Below is a draft write-up you can use for a patch note summary, blog post, or social media update. cardfightvanguarddeardaysupdatev160teno link
So a player searching this is looking for guides, boss strategies, or unlock requirements for the Emperor Link mode introduced in patch 1.6.0. There is no official v1