Asset Import Issues "Package corrupted"

I’m getting an error when importing an asset package for a game mod. The game mod knowingly works as the whole community of the game designs these mods.
When I import the package I get an error reading “Package corrupted, deduced GUID exists but at different destination path, refusing import.”

I have attempted to reinstall Unity, redownload the package, and nothing seems to work.

I’m running Unity 2017.4.9f1

The game is Descenders if anyone is interested.

6134333--669023--unity error.PNG

Some more photos of the console messages, and the import asset package window.