Update: They weren't able to renew the domain. They still own it, but they are using makemkv.info for the time being. Seems to be the forums only, for now.
I'd like to know, as well. It was working yesterday. I had just reinstalled Windows and downloaded MakeMKV. However, it was unable to download the HK and SDF files needed for decrypting, so I'm unable to use MakeMKV. Others were having the same problem on the forums, I went to check to see if there were any updates, and the whol thing is currently gone.