Getting this:
"Plugin filename Bloodtrail.cs must match the main class BloodTrail (should be BloodTrail.cs)"
after updating.

Looks like the t is not T. Gotta love programming eh:P

Edit: Ok I just looked at the download again and it seems to be spelled properly. Not sure how I got it misspelled the first time. Unless the old file was spelled with a lowercase and it matched that.
Guess it's not a problem afterall. Your thoughts?

Your filename needs to be BloodTrail.cs, not Bloodtrail.cs. Delete the old or rename it, the download provided is fine, but Windows is sensitive with that.

Yeah I figured that out by mock downloading the file after I sent this post. It was named Bloodtrail.cs when I first downloaded it, but the second time I did it was named properly BloodTrail.cs. I've never played with mod filenames, so I was confused how it happened. Thanks anyways for the reply.