at Windows Server 2012 R2, I can't install the 3.5 Framework

I wish this worked...

1. open "Server Manager" (probably the leftmost icon at the taskbar)
2. click "Manage" at the upper right where it says: Manage, Tools, View, Help
3. pick "Add Roles and Features"
4. tab through the wizard to reach the set of checkboxes in the "Features" portion of the wizard and check the ".NET Framework 3.5 Features" checkbox there
5. "Confirmation" is the next page in the wizard and herein you should click the "Specify an alternative source path" link
6. you will have to specify a path to a file and the file should come from https://www.microsoft.com/en-us/download/details.aspx?id=21
7. finish up the wizard
8. run the service pack 1 update at https://www.microsoft.com/en-us/download/confirmation.aspx?id=22

...but it doesn't. I need the 3.5 Frameworks with Service Pack 1 to set up SSMS 2014. :(