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reopen an older version an edit it in the modeler. When you save your changes, a new version will be created and saved as the latest revison of your diagram
see comments attached to diagram versions, that where created by setting the configuration Enter changelog when saving the file
set Milestone versions - mark special versions and give them labels
As a shortcut to switch between different diagram versions you can also use the version dropdown located right next to diagram name in the navigation bar.
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Compare Diagram Versions
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To do this go to View > Compare diagram versions or use the compare button in the toolbar. You are asked to choose two versions you want to compare. After confirming your choice, you have the two versions displayed side-by-side. Changes are coloured colored according to whether something was added, deleted, moved or changed. You can click on the entry in the List of Changes and the process element will be highlighted in the two diagrams.
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