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.NET Framework 3.5 is essential for running many legacy applications on Windows, and it can be installed or enabled easily on Windows 10 and 11.
Download Microsoft .NET Framework 3.5 from Official Microsoft Download Center
https://geekchamp.com/how-to-enable-or-install-net-framework-3-5-on-windows-11-10/
Thank you Terry! I was able to work my way through the electronic provisioning documents and got Prime 3.0 licensing and up and working, but hesitated attempting to install Mathcad 15 as I didn't know how downloading and installing Net Frame 3.5 and some earlier versions might affect my new Windows PC. If anyone has successfully done this without deleterious effects, that would be appreciated. Here's a link to a good article on how to accomplish what I did: - PTC Community.https://community.ptc.com/t5/Mathcad-Installation/How-to-obtain-Mathcad-Single-User-and-Student-Licenses/m-p/706384#M16
.NET Framework 3.5 is essential for running many legacy applications on Windows, and it can be installed or enabled easily on Windows 10 and 11.
Download Microsoft .NET Framework 3.5 from Official Microsoft Download Center
https://geekchamp.com/how-to-enable-or-install-net-framework-3-5-on-windows-11-10/