This video tells how to open password protected ZIP files without password. What you need to is finding the lost ZIP password. Then open your password protected ZIP file with the password.
To find ZIP password, you need this iSumsoft ZIP Password Refixer tool. Free download:
1. Install this ZIP Password Refixer on your computer.
2. Run this tool. Open a password protected ZIP archive file in it.
3. Select one password attack type.
4. Click the Start button to start to discover ZIP password.
5. It successfully finds ZIP password. Then you can open your password protected ZIP file with the password.