After you fixed the blue theme, I downloaded and had some issues (mine not yours!!) so I needed to download again and now back to the same error "file is not valid"
When selecting the download file in the OP, the following message shows:
Invalid or Deleted File
The key you provided for file download was invalid. This is usually caused because the file is no longer stored on Mediafire. This occurs when the file is removed by the originating user or Mediafire. If you believe you have reached this page in error, please contact support.
Thanks for your help. Hope this is clearer than my previous post.