What are you running (Windows, macOS, or Linux)?
You are running an old version of MakeMKV that points to an obsolete server URL. How to Fix the Error (Step-by-Step) makemkv automatic hk downloading is disabled or failed
In the context of MakeMKV, stands for Hashed Keys . These are small data files required to decrypt the AACS 2.0 protection found on UHD Blu-rays. Unlike standard Blu-rays, where the software can often calculate the keys locally, UHD discs require a specific key that matches the "hash" of that particular disc version. MakeMKV is designed to automatically ping a central server to download these keys when it encounters a new disc. Why the Error Occurs What are you running (Windows, macOS, or Linux)
What of MakeMKV do you currently have installed? Share public link These are small data files required to decrypt the AACS 2
Are you attempting to rip a or a 4K UHD disc ?
You can also find community-posted keys on the MakeMKV forums for specific problematic discs.