Sometimes, when one logs into https://portal.office.com, the link/button for downloading is not present at the upper-right corner. One thing to try is this, right after login:
https://portal.office.com/account/?ref=MeControl
If that doesn’t get you to downloads, try these steps:
Click on ID ball at the upper right to pull down menu
Click on View Account
Click on Subscriptions at lower left
Click on Apps & devices near lower left