Web Test recorder is disabled in IE11, Win7

I am trying to record a web performance test using the web test recorder 14 plugin in the explorer 11. I have the exact same problem as described in this very similar post, which unfortunately does not solve the problem for me. I did the following tasks:

1. Looked in this post which does not contain my case
2. Made sure that "Web Test Recorder 14.0" and "Microsoft Web Test Recorder 14.0 Helper" Add-on is enabled
3. Made sure that "Enable Enhanced Protected Mode" in the internet options is not checked (see here)
4. Even deleted some registry keys as suggested on the page I mention the line above.
5. Restarted the computer.

Any idea how I can fix this problem?