Can't find the Mermaid Tail mod

Hello! I've been searching for a certain mod, ThatPreston's Mermaid Tail mod. I've been through all of the packs and several threads but I have been unsuccessful at locating it. Has it been removed or do I need special permission to obtain it?

Thank you for trying to help but it says "file not found."

I found the problem, thank you so much for the help!