There is no direct upgrade path from the Console Server 3.0. to version 4.x.
Akkadian Console Server is only available as a Linux virtual appliance and is no longer supported on Windows.
Existing Windows client can be migrated to Linux in easy three steps.
Step 1: Deploy Virtual Appliance for deployment guide please follow instructions in the Virtual Appliance Deployment section.
Step 2: Login to your current portal running on window server and take backup, it will download a zip file.
Step 3: Login to License portal and revoke your window license.
Step 4: Login to your new Portal running on Linux and activate your license.
Step 4: Login to your new Portal running on Linux and browse to downloaded zip file and click restore.
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