For new development, and run on Windows 10/11 or Linux. For legacy apps, plan a migration path away from Windows 7 before 2024 ESU ends. Quick Reference Card (for sysadmins) ✅ Windows 7 SP1 + KB2670838 + SHA‑2 updates ✅ Run offline installer as Admin ✅ Reboot after installation ✅ Check with: reg query "HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full" /v Release Release REG_DWORD = 528040 (.NET 4.8)