This is the true "Windows Exclusive" legacy framework. It is the last of its kind before Microsoft shifted to the open-source, cross-platform ".NET" brand.
The issue was that the company had a slow internet connection, and the online installer for .NET Framework 4.9 was not cooperating. It kept failing to download the necessary files, leaving Sarah's computer without the required framework. net+framework+49+offline+installer+for+windows+exclusive