Why do you need an update ST4 license for Free Solid Edge 2D Drafting?
When you install the software, the ST4 license will be installed for you.
You should only need a license to update ST3 and before.
If you downloaded and Installed Solid Edge 2D Drafting ST4 and the license was not properly installed, I ned to understand your current situation.
Make sure you temporarily disable the UAC. You can reset it after installation. The UAC cann affect the installation.
Make sure you install as an administrator.