This is how the install the "NASA" "Backdoor" on your computer disguised as a UI / UX error.

Do you think that this is an UI/UX or coding error?
Don't you think, that the software developer would find this out, if he/she would just "test" this application simply by running it an clicking around?
I think that this behavior was intentionally programmed that way.
I don't know why, but since early /mid 2000s, this "Anti-Virus" (or maybe NASA backdoor?) is added in too many installers and too many software.
For more Information just watch the full movie:
• Middle Men - Trailer
And there is not much different to Mcaffee:
• John Mcaffee How To Un...
• When John McAfee told ...