100 times I have checked in Tools -> Extensions and Updates -> Updates -> Product Updates. I don't see any updates to Xamarin 18.104.22.1684 in VS2017.
I have a VS2015 install too but I could update there.
My Mac has got the update. So when I try to debug an iOS app, the Xamarin versions are different. So far I have not got any new issues due to this but that is not correct.
So how to get the Xamarin in VS2017 updated?