You can recover your 7z password with SysInspire 7z Password Recovery Software. This tool is really useful; I used it to retrieve my 7z password that I had forgotten. It gives you three password recovery choices for 7z such as- Brute Force, Mask Attack, and Dictionary Attack.  You can use it for every Windows edition because it worked effortlessly with all of them. It also comes with a free trial version that allows you to test out the recovery techniques.

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