The free version supports password less then 3 letters only.
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Open the file you want to recover password from.
Before recovery, you'd better tweak the settings depends on your knowledge of your password. It could greatly affects the recovery time and the result of recovery.
When ready, you can click "Start Recovery" to start.
Now, all you can do is wait. It may take a long long time.
Sometimes, the recovery would take a long time. You can interrupt the recovery by closing the application and continue to recover next time. The application will save current session state automatically.
If you are lucky, you can recover the password successfuly. Congratulation! Just click "Copy to Clipboard" to copy the password.
If you suffer from bad luck, sorry, we can't recover your password. Maybe you can try to tweak the settings and retry. We will pray for you.
Finally, the last tip:
Next time, when you set a password for a rar file, just write it down on a piece of paper and keep it in a safe place. Don't trust memory, sometimes, it could betray you. Good luck.