I have been getting this for a number of months now, so long I can't even recall when I started getting this.

No other mod I use on any other server, has issues with anonymous updating and yet this mode does. Is there something wrong with the way steam is working with this mod, is there an issue with the way this mod is on steam or is there something else going on.

Any help would be appreciated.

If it helps ASM is doing the same thing, I use my own WebAPI key, but use anonymous login and get the same error.