How to upgrade Anaconda version without internet connection

Hi all,

We need to update Anaconda 3.5.2 on one of our W2K16 servers because his built-in Python version (3.6.5) has vulnerabilities.
What is the solution to update this version of Anaconda on a server that does not have Internet access?

The command “conda update anaconda” is for example not possible.
If however we need to install a new version from scratch, what data should we save in the anaconda program folder?

Thanks for your help!