i don´t know why it was out for me, but I received it via Garmin Express Mac 6.9.0. It installed o.k. over my existing 5.57BETA, but did not solve a Bike PowerMeter Problem introduced while updating from release version 5.1 to 5.57BETA. I see a lot of extreme high power peeks >50.000 Watt which screw up all other statistics like average power, FTP, calories,..... just not usable any more. So if you rely on you pwoermeter... I would stay away from 6.0 and wait / follow the forum about what should have been fixed and which new problems come up
I also received it sometime. I did not plug into GE. I just went into settings and it told me the watch updated. Funny thing is I was on these forums last night and saw beta versions < 6 and almost posted asking why I just got 6. I've only had this watch a week. (a week today in fact).