From what I see based on that error, you did not copy the contents within the folder into the game file - you just took the entire file and put it into the game folder. You need to copy the contents within the 'XOXO Droplets Mod' file and paste them into the game folder. Taking the entire file and putting it in the folder will result in an error.
I also feel like you maybe didn't delete the archive.rpa file since the error also says that a variable got defined twice, which is a different error than should be expected... Might be wrong and renpy decided to just be weird, but that's definitely also something to note.
