Are you trying to extract password-protected 7z then you should use eSoftTools 7z Password Recovery software. This software is used by all users and it extracts password-protected 7Zip files without a password, you can also extract passwords by using these techniques Brute Force Attack, Mask Attack, and Dictionary Attack. By using any one of these techniques you can extract your 7Zip file. For step-by-step process and more information, you can download this software for free and also use the free demo version by clicking on the link given below.

INFO;-Extract password protected 7z