Hello @LaJague, Welcome to the /e/OS users forum.
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in the → settings → system updater, you must insist on the refresh button… (5-10 times) or wait for 2 days to be notified…
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of course, because it is not the right file for updating
you need e-3.3-a15-20251210556408-official-FP6.zip,
not IMG-e-3.3-a15-20251210556408-official-FP6.zip.
how to manually updating is like [HOWTO] Upgrade my /e/OS to major Android version without loosing /data