Download Stock Image/Standard or Extended

This is the first time that I have to let my disappointment out with customer service here...

I am trying so hard to understand the usage of "standard stock" versus "extended stock". I had to google and read the fine prints to understand it myself. So I'm good there. 

Then comes the downloading part. I try to buy a stock image and it does not give me the option to choose between a standard version or an extended version. I keep telling the agents this via chat and they keep offering deals on credits that I can't afford. 

All I want to do is get this stock site to work for me. I want to be able to login, select an image, click buy, have the option to choose standard or extended", and call it a day. 

But for some reason, it's not working for me. It is trying to make me choose a monthly plan that i don't want. I am not getting the help I need. I've been online for over 2 hours chatting with agents and I'm so disappointed to be left to my own.... I don't know. I just need help.  

Help is needed here.