The Enterprise/IoT LTSC versions of Windows 10 with extended support up to 2032 are available with commercial Visual Studio licenses iirc. If you can't somehow get hold of an ISO from your office's IT admin you can always sail the high seas :) You can evaluate it here: https://info.microsoft.com/ww-landing-windows-10-enterprise....
Getting an unverifiable iso for Windows seems like a bigger security risk than Recall tbh. Does MS publish hashes for the LTSC versions to at least let you ensure what you have hasn't been altered?
Be sure to check the hash with the link provided in comment from dartharva's. Hint, it checks out.