Never download "Pre-activated" or "Cracked" JDownloader versions claiming to have a built-in premium database. These are often malware. Always use the official JDownloader 2 installer and add your own trusted accounts. Conclusion
Queue hundreds of links and let the software handle the rest. Understanding "Premium Databases" jdownloader 2 premium database premium account install
Step-by-Step: How to Install Premium Accounts in JDownloader 2 jdownloader 2 premium database premium account install