E810 here
Tried to update to 4.91 from https://www.intel.com/content/www/us/en/download/19625/non-volatile-memory-nvm-update-utility-for-intel-ethernet-network-adapters-e810-series-windows.html
And it is such a PITA, wasted 3 hrs trying to make it work.
Long story short, the latest firmware that Opnsense 25.7.8 ice driver supports is 4.50
[1] ice0: fw 7.5.4 api 1.7 nvm 4.50 etid 8001d8ba netlist 4.3.5000-1.14.0.99840ef4 oem 1.3597.0
They're not paired. The driver will work fine (and not complain) with a "later-than-recommended" NVM. I'd always go for the latest NVM, but the E810 has been around for long enough (2019?) that the major bugs should have been killed by now. I'd have to look at the release notes to be sure. At any rate, I'll update if convenient or necessary (I experienced the latter with some old X710s).
What issue were you having with the update? Your link is for Windows; I don't know what the package includes. (I use the EFI updater.)