It looks like the MP3 encoder cannot be installed. I see that you are still on Windows 7, first you should make sure that all Windows Updates are installed.
Second, make sure TLS 1.2 is enabled, you can do this through Internet Explorer:
- open Internet Explorer 11
- click on the 'gear' icon in the upper right
- select Internet Options
- click on the Advanced tab
- scroll down to the last section Security
- check the box at the bottom of the list for Use TLS 1.2
- select Apply
- select OK