I'm not aware of an English download still in existence.
The download for Kn7000 ver 1.6 is the first one where it says "Kn7000 ver 1.6", the first 2 disks are the ones where it says "disketten 1 und 2".
To make the floppies run the executable files and click "weiter" with a formatted floppy in your drive.
The screen disk check is the check that is offered to you in the screen when you run the floppies in the 7k.
To run the floppies insert disk 1 hold down panel memories 1, 2, 3 and 4 and switch on. You will see checkdsk or update options, check first, it then will tell you to swap to disk 2.
To upgrade repeat the same steps with update.
Naturally firmware upgrades are at your own risk.