I'm having the same issue with TurboTax Home & Business 2017 on my MacBook Pro running OS X 10.11.6 El Capitan. I've been through the install/update/uninstall/re-install process a few times, with the same results "Please wait while we verify everything is up to date", and then TurboTax shuts down. The very first time I installed it, there was a message stating that this was the last tax year (2017) TurboTax would work on my version of OS X, and that I would need to upgrade for the next tax year. The problem is that Apple has capped my OS X updates at 10.11.6 because of my CPU, an Intel Core 2 Duo, a dual core CPU running at 2.4 GHz (with 4 GB of main memory) which Apple has decided can't running OS X beyond El Capitan.
