Trying to uninstall an extension from a command line or script triggers and unwanted update attempt of the other installed extension, possibly even trying to update the extension that's to be uninstalled.

h4. Steps to Reproduce
Launch MPEInstaller.exe with the /Uninstall parameter or any other argument starting with /U for that matter.

h4. Additional Information
The issue lies in the way MPEInstaller.exe parses command line arguments. It compares the arguments with "StartWith" thus /Uninstall also includes /U whici is the switch to trigger extension updates.