Old topic but it may help other people as I had the same issue:
Make sure to type “UrBackup.exe /S” and not “UrBackup.exe /s” as NSIS is case sensitive (source).
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Old topic but it may help other people as I had the same issue:
Make sure to type “UrBackup.exe /S” and not “UrBackup.exe /s” as NSIS is case sensitive (source).