Download NotebookSync
Free to use with up to 3 notebooks, without the Outlook calendar and Microsoft To Do. With a license code everything comes along; you do not need to reinstall anything.
Then open the file and follow the installer. At the end NotebookSync starts; you find it in the notification area, at the bottom right next to the clock.
Requires: Windows 10 (version 1809 or later) or 11, 64-bit, the OneNote app for Windows (Microsoft 365), the reMarkable desktop app and the .NET 10 Desktop Runtime (free from Microsoft; the installer helps you get it). What is new?