Hello
I have quite a few routers not connected to the internet.
Some of these I want to upgrade to ROS4.0B4.
But how do I get a new key for these?
your computer running winbox should have access to internet. router itself do not need it.
Correct 
Hello
I have quite a few routers not connected to the internet.
Some of these I want to upgrade to ROS4.0B4.
But how do I get a new key for these?
your computer running winbox should have access to internet. router itself do not need it.
Correct