14.8 Update Fail

To update all of these requirements must be met:

• For an update to 14.8 you must have 2.5 GB free
• You must be connected to a Wi-Fi network (and not a personal hotspot) unless it is an iPhone 12 series with an active 5G network connection
• The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
• The phone must not be in Low Power Mode
• The phone must not be connected through VPN
• The phone cannot be in Airplane mode

I was getting this same error; I ended up skipping 14.8 and updated directly to 15 with no problems.