Crustybucket: Ok...new user here......paid for program, and it says I got it. Now I want to download it. Get a screen that says I have to download an app. This is for my desktop PC, not a smartphone. Am an OF (old fart) with very limited understanding of how this stuff works (I just LOVE plug & play). Getting very frustrated !
First of all: Welcome!
Considering yourself OF you'll feel right at home here... Many of us around.
As Breja wrote, you can download the installer (just like in the old times) from your library. Just make sure to download all files (usually there are more than one) into the same directory.
Or you can download the Galaxy "app". Which is simply a game-manager/launcher which helps with installing games from this site and keeps them up to date. I personally find it very convenient, but people here have rather mixed feelings about it, because it resembles the Steam (you might have heard of that one?) client. That's for Windows only though, at least ATM.
Maybe some other user can post some screenshots - mine wouldn't be helpful, because I have heavily modded the site and it would look quite different on your machine.
PS: I you have trouble, you can also ask people like me in chat (hover the mouse over the username and see if "Start Conversation" is available - some users only accept chat requests from friends).