HELP! Need twrp or root for T-mobile LG G4 that already has OTA 6.0

Unable to install root without twrp installed. Unable to install twrp by known oneclick method as pc screen says done and to pull battery, yet phone shows nothing in progress bar and "0" processed. Have done this many times to no avail including assuming it worked and pulled battery and tried recovery with only OEM recovery working.
Am using T-Moble lgg4 H81120i v.6.0 done by OTA update. Am running windows 8.1 with antivirus off and all drivers installed and running.

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