Shukfir
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I'm just a little worried that all campaign progress might be lost, and I'll have to start playing again from scratch...
All achievements, dynasty weapons, saved heroes, the list of completed campaigns and scenarios, and online saves are stored on the Ubisoft server.
In my opinion, the best solution is to completely uninstall the game and reinstall it. The game should automatically download all patches and update to the latest version (of course, if it's a licensed copy). The main thing is not to interrupt this process. If you have offline saves, copy them to another location beforehand.