You don't have to disable UAC and you don't have to run JDownloader as administrator. But if you want to download to the root of a drive, you have to give your user permission to do so. This has nothing to do with JDownloader. It's simple permission model of windows. Either you setup as you need it or you use one of the given solutions.
I wonder why we have to explain such stuff again and again.
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JD-Dev & Server-Admin
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