MSI extraction needs to handle "Another program is being installed. Please wait until that installation is complete, and then try installing this software again."

[hach-que]

MSI extraction happens for Windows and confidential platform setup. We need to capture this output from msiexec.exe.

Also of note, msiexec's output is in UTF-16, so currently we get A<NUL>n<NUL>o<NUL>t<NUL>... in the byte stream, so we will need to handle this as well when detecting that message.