It's not possible to directly unzip an archive if you don't know the password. The only way is to bruteforce it using a recovery application. Luckily for you, there are plenty of programs created for this purpose. You can browse the database of Software Informer in order to obtain one. You will find apps that allow you to recover the password using different recovery options. However, for all the options, it will take from a few hours to days.
