Something I’m finding somewhat frustrating when trying to download challenges:
I choose a challenge with a standard race, such as federation. I choose this because it’s compatible with everyone.
When I go to download it, I get the message that the challenge has content that I haven’t purchased. To see what this missing element is, I go to the website, only to find I need the Nomads expansion pack to fight the Federation!
My guess is that the person issuing the challenge ticked one of the boxes indicating you need certain content, when you actually don’t.
Many, many challnges are like this. It’s unnecessary, and will get less attempts on your fleet.
Tick the right boxes before you upload people! You’ll get more attempts.
(yes, I could just buy the expansion pack. But people could also issue the challenge properly too and I wouldn’t need to buy)