The JDownloader installation from your archive works fine for me, but yes, no accounts available.
As there is no .hs_err file in your JDownloader, chances are high that JDownloader got killed by Firewall/Av. Under normal situation a crash of java would result in a crashlog (hs_err file).
This would also explain why the copy-on-write of your accounts failed, there is no trace about any account list.
You can import old list if you want by drag/drop the downloadList and linkcollector zip with highest number into your JDownloader
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JD-Dev & Server-Admin
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