Can't get Makemkv to run

[robbo]

Hi!

I am on Sequoia 15.0 on M1 iMac. I downloaded 17.7 code today and tried the beta key. It seems to accept the key and asked me to restart the program, but it sticks in a loop. It launches with the "application too old" popup message. Pressing register gives a Fatal warning popup. Pressing OK brings up the licensing popup with garbage in the key field and invalid in the type field. If I clear the clear the garbage out and enter the Beta key and press purchase it asks me to restart. And so on. Somewhere I may have a step wrong, but the key is supposed to be until October 2024 and we're still just in September. Any clues as what I have done wrong?

[Woodstock]

Do you have a disk in your drive while trying this? Your drive must be empty for the key to register, then you have to restart MakeMKV to make sure it was read.