If automatic download continues to fail, you can download the file manually.
If you are unable to resolve the connection issue, you can bypass it entirely by manually acquiring the necessary decryption file. The community-maintained KEYDB.cfg file serves the same purpose as the official HK files. makemkv automatic hk downloading is disabled or failed
The MakeMKV community actively maintains a text file containing thousands of known UHD hashed keys. If automatic download continues to fail, you can