Even the offline installer checks for (CRL checking) and may download language packs if you chose a non-English base installer. To make it fully offline, run it with the command line flag: NDP481-x86-x64-AllOS-ENU.exe /DisableCRLCheck
Before running the offline installer, ensure your system meets these minimum specifications: Demystifying Microsoft .NET Long Term Support (LTS) in 2026 net framework 481 offline installer microsoft
| Feature | Web Installer | Offline Installer | | :--- | :--- | :--- | | | ~1.5 MB | ~120 MB | | Internet Required During Install | Yes (continuous) | No | | Reusability | No (needs to redownload each time) | Yes (copy to USB, share on network) | | Best For | Single machines with fast internet | Air-gapped networks, labs, mass deployment | Even the offline installer checks for (CRL checking)