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When a download finishes, the download will also take up double space on the disk, since it'll remain in the unity too. The reason the cache needs to duplicate files is because they're pre-encrypted before being transferred.
iso files are usually safe to download, but there's always chance they can be fake or contain malware. Sometimes you might see in your search results people will upload junk text files named with a copy of the file name followed by 偽物 to indicate the file in question is a fake. An iso can't execute anthing on your machine, so you're safe to just download them, but after the iso image is burnt to a disc, there's chance that it could contain malware etc. If the image is a DVD video, it's safe, but if it contains binaries there's a chance they could be malware. If you're paranoid run a virus scanner (and disable autorun of course)
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