Hi @Ariane Hansen
Yes, you can install OneDrive separately. You can get installation package from: https://support.microsoft.com/en-us/office/onedrive-release-notes-845dcf18-f921-435e-bf28-4e24b95e5fc0
If you still cannot find OneDrive after re-installation, it is recommended to locate to C:\Users\UserName\Appdata\Local\Microsoft\Onedrive\24.XXX.XXX.XXXX
and run OneDriveSetup.exe.
(Please note, the "UserName" is your Windows account name. If you cannot find "Appdata" folder, please go to File Explorer > View in Show/hide group > check the box of "Hidden Items". Besides, "24.XXX.XXX.XXXX" is the version number of OneDrive.)
If this application is not found, you may go to folder to run OneDriveSetup.exe: C:\Program Files\Microsoft OneDrive\24.XXX.XXX.XXXX
.
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