Microsoft has released an out-of-band (OOB) emergency update—KB5086672—to address installation problems introduced by the March 2026 non-security preview update (KB5079391). The optional cumulative preview, which shipped for Windows 11 versions 24H2 and 25H2, was pulled after users began reporting installation failures with the error code 0x80073712. KB5086672 was published on March 31, 2026 as a replacement that both restores the