The official method for upgrading from Community v5 to v6 involves an automated script provided by the EVE‑NG team. As documented in the EVE-Doc-2024-External-CE-Upgrade-v6-01.pdf guide, the script can be downloaded and executed:
If you are looking to update an older version or safely downgrade an existing environment, managing the "UPD" (update) process properly is vital to prevent data loss. Step 1: Back Up Your Topologies and Images Before changing anything, export your hard work.
Download the specific older ISO/OVA from an authorized source. Perform a clean install on your server or virtual machine ( /Proxmox). Always run /opt/unetlab/wrappers/unl_wrapper -a fixpermissions to ensure files are compatible. Where can I find older EVE-NG versions?
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Forum posts indicate that "as far as i know, there is no 'downgrade' possibility" and a user attempting to downgrade from v77 to v76 was told there is no official downgrade path.
If your goal is to return to Community from Pro, you can run commands like apt-get install eve-ng eve-ng-guacamole to attempt a rollback, but and can break your system. For most users, a fresh install after a full backup is the only reliable path.
Which (ESXi, Workstation, Proxmox) are you using? The official method for upgrading from Community v5
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fails, it may be because the Ubuntu repositories for your old version (like 16.04) have moved to "old-releases." You may need to edit /etc/apt/sources.list to point to ://ubuntu.com Windows Client Pack: Ensure your local PC has the latest EVE-NG Windows Client Pack
The community version, such as version 2.0.x, is free and open-source under the Apache License 2.0. ISO & OVA Files: Download the specific older ISO/OVA from an authorized
+-------------------------------------------------------------+ | Post-Downgrading Troubleshooting | +------------------------------+------------------------------+ | Issue | Solution | +------------------------------+------------------------------+ | Database Schema Mismatch | Run "eve-info" to check DB | | | health & reset MySQL tables. | +------------------------------+------------------------------+ | UKSM / Memory Issues | Manually enable UKSM via CLI | | | for older Linux kernels. | +------------------------------+------------------------------+ | Permissions Errors | Run the official fix script | | | to reset file permissions. | +------------------------------+------------------------------+ Fixing File Permissions
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Then:
: Versions like v2.0.3-105 are specifically archived by community members because they still support unrestricted multi-user functionality. Where to Find and Download