Our website provided a free download of Apple Theater Mode Updater 2.0 for Mac. The software is included in Audio & Video Tools.
From the developer:
Theater Mode is used on some iMacs and on desktop Mac systems that have an Apple Studio Display CRT attached (with the Apple Display Connector). It brightens movie playback in some applications like iMovie and QuickTime Player.
You may want to check out more software for Mac, such as Apple Lion Recovery Update, which might be similar to Apple Theater Mode Updater.
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