i am unable to download all the episodes of a tv show because my disk is full the message says I should delete files and empty trash I have downloaded 7 of the 9 episodes??

I purchased a tv show with 9 episodes. I was able to download 7 of the 9 episodes. I am unable to download the last 2 episodes and I am given the message that the disk I am trying to use is "full" and it goes on to tell me to delete files and empty trash. I have deleted the first 7 episodes (after i watched them) and still cannot download the last 2 episodes. I have no idea what to do next