(do not double-click):
Running .NET Framework 1.1 SP1 on a modern network requires strict security precautions. Microsoft officially ended extended support for this version over a decade ago, meaning it does not receive patches for modern exploits. microsoft net framework 1.1 service pack 1 64-bit download
For most users, consider running the legacy software inside a instead of installing .NET 1.1 directly on a modern OS. (do not double-click): Running