For the yearly administration shizzle, the direct link to Dashboard: Invoices – Proton Account (account.proton.me/u/dashboard#invoices) where sometimes you have to visit one of your product first.
The reason is that at the time of writing, this was documented to be in a different place, as per [Wayback/Archive] How to download, customize, or pay invoices | Proton
Log in to your Proton Account at account.proton.me on a computer, click Settings → All settings → Dashboard, and scroll down to Invoices.
You start at [Wayback/Archive] account.proton.me/login and end up at account.proton.me/apps and that is where you cannot choose settings. You can however go to individual products and via that to the above invoices link. That’s cumbersome, it is way easier to just follow that invoices link, but in case you want to go via the products, these are the steps to follow:
The Wiert Corner - irregular stream of stuff 