Is there a way to force download of latest decrpytion keys?

[HL-DT-ST]

Or does program do it once per day? How it work?

I did send in 4 keys to admin email last night, hopefully they got it, as file attachment expire in 24 hour. I would PM admin to ask that, but you have to have more posts for that permission.

[Woodstock]

If enabled, MakeMKV will download the hash key file as needed, usually at program start-up.

You could manually fetch it, but I don't know the URL myself.