That is very strange. I'm sorry you are having trouble!
I tried your activation code on Windows 10 using the latest launcher (
3.8.70) and I see the OK button after pasting your code. The code is 32 characters.
What happens if you just type
a 32 times? You can just hold down
a until it fills up the whole text field, at which point the
OK button should appear. Eg:
Can you please post your
spine.log file? You can find it here:
<user home folder>\Spine\spine.log