PrintNightmare fix is included in KB5004953 (Monthly Rollup) Out-of-band that released on July 6, 2021, you could get this KB from catalog:
https://www.catalog.update.microsoft.com/Search.aspx?q=KB5004953
Please note: only if you buy Windows Server 2008R2 ESU then you could install this KB5004953
Besides, if you buy ESU and keep your 2008R2 server is up to date, you don’t need to install PrintNightmare update Specifically. The latest Monthly rollup KB 5004289 which released on July 13, 2021 includes improvements and fixes that were a part of update KB5004953 (released July 6, 2021) and addresses the issues.
https://support.microsoft.com/en-us/topic/july-13-2021-kb5004289-monthly-rollup-c4067c98-da5a-4aec-a40f-486cbc5e2374
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