I've tried Tenor Sax-Portato and it downloads fine here.
However, in your list its size is 51KB, while it's supposed to be 5.6MB.
I suggest this:
1. clear the downloads in the Download Manager (options menu)
2. if that doesn't fix it, redownload and reinstall the downloader
Here you can find (time limited) beta's for plugins & program components
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