Hi

I want to create a secure Electrum cold storage from an existing seed. I want to create the wallet on an offline computer, but it seems like I need an internet connection to finish the process. It says something along the lines of "to finish creating the wallet, you need an internet connection. Get online or move the wallet-file from an online computer to this computer".
I'm following the guideline found on Electrums webpage for creating a cold storage. But it doesn't cover how to go about this issue.
Anybody know what to do to create a truly secure cold storage without having to type in my seed on an online computer?

Sincerely