The final official build number for a fully updated Windows 8.1 system is Microsoft Learn Final Update Rollup:

Ensure your Windows 8/8.1 key is ready. If you are upgrading from Windows 8, you may need to install 8.1 as a "free update" through the setup environment [10, 25]. using NTLite?

: Community members sometimes host pre-updated ISOs. For example, some users have uploaded Windows 8.1 x64 Fully Updated images containing nearly 200 pre-installed updates. Note: Use community-hosted ISOs with caution as they are not official. 2. Slipstream Updates with NTLite

A "fully updated" ISO is essentially the 2014 "Update 1" version plus nearly a decade of monthly rollups. NT 6.3. Security Baseline: Includes the final January 2023 updates.

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