I struggled trying to download/install 2019 on a new home system from my Intuit account last night. 

2018 seemed to install fine, but 2019 went sideways!

It got to the EFIN licensing part and Id get a popup window that said EOC cant be empty and it would make me fill in my firm info, but the EFIN section stayed empty and the License Products portion was greyed out, I uninstalled and reinstalled multiple times, I finally uninstalled everything related to Proseries and rebooted, skipped the 2018 install and went direct to 2019.  Still got the EOC message, but this time the License products option wasnt greyed out, I was able to License it and it finally acted normal, I think the 2018 install had an issue from the beginning....but every year was a super slow download (2020 or 2021 got stuck on one file and I had to cancel, uninstall, reboot and start over) it was a long painful evening!