I thought there is an Xposed disabler (in the xposed thread) that you can run rather than uninstalling?
That being said.. this information has been the same for EVERY OTA Update. You have to flash stock recovery for the OTA to install, and your system can't be modified too much or it will fail the validation checks built into the OTA.zip. (i.e. there is a manifest file that checks for specific files and their check sums before it will flash the ota).
IF you are close enough to stock (like I am... stock, unlocked, rooted, with adfree, wifi tether for root, greenify, Quick boot, and a few other apps that require root), you can just flash stock recovery and take the OTA.
IF you are close enough to stock... you can also use the following... WITHOUT a PC... i.e. you haven't modified system too much, etc.
- Place stock recovery.img, the latest TWRP img, the latest SuperSU.zip and the OTA.zip on your phone's DOWNLOAD folder.
- Install Rashr.
- Use Rashr to to flash stock recovery (select other from storage, and select your stock recovery). When it completes, pick the option to reboot to stock recovery.
- From stock recovery, install the update zip and reboot the phone.
- After the update install process is complete, use Rashr to flash TWRP (again, other from storage and pick your TWRP). When prompted, reboot into recovery (so twrp sticks). When in TWRP, select reboot to system.
If you lost root, reboot into TWRP recovery and install SuperSU.zip