Link?
Are you using twrp to flash?
https://forums.oneplus.net/threads/cm-11s-38r-ota-is-out.136950/page-17 post 336 the xda link.
I've not tried it. But people flashing the update from twrp are having no problems.
Oh and it's "link PLEASE"

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Yup, thought we'd been through this. Dunno why he doesn't just buy an iPhone and be done with it