Here's a firmware only zip file from this OTA for any S-OFF users that want to flash just that portion of the update. The 1.58 hboot, which is already available separately, and the boot.img file have been removed.
Important note for S-ON users:
Do not take this update and then root or you may not be able to get S-OFF. The unlimited.io procedure wants the RUU flashed before doing the wire trick but the setmainverlow.zip may not be enough to allow flashing a back level RUU because the hboot is also getting updated with this OTA. Therefore, it may not be possible to get back to 100% stock when S-ON with this update installed after flashing a custom recovery and rooting.
One solution may be to flash a totally stock, unrooted ROM and the stock recovery before doing the wire trick, but that will need to be tested. If/when an updated RUU is available this will no longer be an issue.
ramjet73