Incremental update for rooted users.
I saw that sometimes there are incremental updates here that some users cannot install, in order to install these updates you need to be on the previous version and follow these instructions:
Here you got all files you need to install the update and retain magisk and TWRP. Otherwise you need to wait for asus to make a full update package which typically takes a couple of days after release.
Incremental OTA package - Through TWRP ONLY
Prerequisites (for stock images, see attachments to this post):
Current software stock boot.img
Current software stock recovery.img
Current software stock dtbo.img (only if modified by Magisk or custom ROM)
Incremental OTA zip for current software to new software
Magisk zip (optional)
Ensure you have the latest version of TWRP installed. If you don't, follow the instructions in the OP to flash it.
Boot into TWRP.
Use the "Install Image" feature to flash the stock boot and recovery (and dtbo) images.
Flash the incremental OTA zip.
pposite_Slot-CPTBv2.zip to retain TWRP.
(Optional) Reboot into TWRP and flash Magisk for root.
The key here is making sure the current slot is fully stock (including boot and recovery images) in order for the incremental OTA zip to install successfully.