Currently Being ModeratedFeb 12, 2014 5:47 AM (in response to Alison Kelley)
Open System Preferences / Security & Privacy / General tab and change the settings at the bottom of the window. Once you've installed the apps you can change the settings back.
The MPEG-2 Playback Component should install directly from the disk image you downloaded. Mount the .dmg file and double click on the component. It doesn't install in the Applications folder.
MPEG Streamclip is installed by dragging it from the disk image to the Applications folder and this is where it belongs.
Apple has included some basic MPEG-2 editing features since iMovie version 8 and the component is only used by MPEG Streamclip. If you can't get its installer to run you may have to visit the Streamclip page for the method on how to install it manually using drag and drop.
Currently Being ModeratedFeb 12, 2014 5:24 PM (in response to QuickTimeKirk)
Thank you very much, how simple...(I am).