ZeroShell 3.6.0 --- How to upgrade the ZeroShell old version(3.4.0) to the latest one(3.6.0)

Thank Fulvio develop/share the ZeroShell package for everyone!
It will help me to do some testing in the simulated environment because its function is as Router role.

For security and enhanced function, sometimes we hope to install the new release as the next version and Add-on packages. So we have to require a activation key by doing some process(# 1) next to send the Feature Code to activation@zeroshell.net for receiving the related Activation Key.

I am lazy for requesting an Activation Key and just do it on virtualization Lab, I think maybe there is some method to do the upgrade process. That is the configuration is backup from the old version next to restore to the new version but need to install the newest software at first.

How to do it?
(1).Install the newest ZeroShell software by following the previous article
(2).Backup the configuration from the old ZeroShell version

(3). Restore the configuration to the newest ZeroShell version

(4). Active the imported profile

So do that we can use the newest ZeroShell version as before on Lab now!

Reference:
(# 1)   How to obtain a key       

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(# 2) The above procedure still is compatible with the 3.7.1 version.