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If you want to upgrade to a newer version of 20-sim 4C, go to the 20-sim 4C website and download the new version. After downloading you can install it.

If the new version is a minor update (e.g. version 2.0.x.x), it will automatically replace the old version. After installation you can run the new version immediately. No new license is required.

If the new version is a major upgrade (e.g. version 2.1.x.x or higher), it will be installed next to the old version. Both versions can be used at the same time. The new version will require a new license.