I want root my Z5 without unlocked bootloader
No! The pre-rooted ROM comes in the zip format, for what you need a custom recovery (e.g. TWRP) to flash it. Unfortunately, you need root to install it!
That's why you need to return to either Lollipop or Kitkat, then get root access and install recovery, because there is no custom recovery solution, which runs from your PC, available for Marshmallow right now!
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