| Use Case | Verdict | |----------|---------| | | ❌ Do NOT use 21H2. Use 23H2. | | Offline lab / legacy software testing | ✅ Acceptable with precautions. | | Air-gapped industrial system | ✅ Potentially valid if software requires 21H2 specifically. | | Learning / historical research | ✅ Yes, via VM or offline hardware. |
If you do not have a VLSC/MVS subscription, the following sources are considered legitimate for obtaining the original 21H2 ISO, provided you own a valid Windows 11 license. windows 11 21h2 download