yes they do as i said in the first post
So you do not want anyone here to verify, so we only have your understanding of someone else's understanding?
Do you have MCX installed into any Program Files folder?
I also note you never replied to this very valid question.
Also, if you delete your installed MCX folder, and then unzip the downloaded MCX package, you will have Assimp.dll in the folders Arno indicated. Can you import any other type of file (glTF, obj, etc...)? If so, then Assimp is working correctly.
Why not just zip the dae file, attach it to a post, and let Arno, or someone else re-verify it can load? Or PM it to Arno.