Most likely, an error occurred with the installation of the MicroFour StrataFrame License.dll file into the GAC. When you install the framework, it installs the DDT as well, so installing the DDT a second time probably caused some issues. What I would recommend is open the C:\Windows\assembly\ folder on your computer and check if MicroFour StrataFrame License.dll is installed. Most likely, it is not. To reinstall it, simply open another Explorer window and browse to the file (or re-download it from the My Account area of the website). Then, drag the file from the explorer window into the C:\windows\assembly\ folder.
That will reinstall the license dll into the GAC, and you should be able to run the activation program again.
Any input would be greatly appreciated. Also, if there is any further necessary information I should provide, please let me know and I will post it/e-mail it/whatever is most convenient.