Spintires editor broken!

I would like to know why the Mudrunner editor is allowed to interfere with the Spintires editor.

Why is this a problem?

I cannot create a new map in the old editor without a stream of missing meshes errors I have to click through.

I believe this cross interference is wrong and deliberately cripples software I legitimately own.

Is there a fix? If so please point me in the right direction.

Sounds like a config issue...
I have both installed as well, and no issues with either one...?