Although you can still download Perian, the project is no longer supported. Developers can use Perian’s source code if they want to further develop the project while Mac users can turn to VLC, MPlayer OSX or Niceplayer to play file formats that are not natively supported by Mac OS X. Oct 12, 2013 Downloaded and installed Perian 1.3.2 but don't see/notice any difference to version 1.2.3. The only thing that is different: Perian 1.3.2 extended my context menu 'open with' - 'Perian - Open in QT Player'. It does open QT-Player but not QT-Player 7.
FAQ: QuickTime Not Working with Perian
1. Cannot open Perian on Mac
Q: I've tried to download Perian from different sources but none of them can be opened because of unidentified developer. On you Mac, go to System Preferences > Security & Privacy > General > Allow apps downloaded from… and set your preference, try to open Perian again to see if it works. For any users who can't open Perian for QuickTime, we suggest checking if the components are compatible with the version of QuickTime and macOS.
2. QuickTime with Perian won't open AVI files
Q: QuickTime refuses to play AVI files in QuickTime 7. Any straightforward solution for this problem? It's common that QuickTime won't play AVI files even you have Perian installed on your computer. AVI is a container format introduced by Microsoft, which can contain different types of video and audio codecs unsupported by Perian. You have three ways to solve the error of QuickTime with Perian not playing AVI files:
Try other QuickTime Player alternative, for instance, VLC Media Player, 5KPlayer, MPlayerX etc. Convert AVI to MOV, the best video format for QuickTime. Install other AVI codec packs to help QuickTime play AVI media files.
3. QuickTime doesn't play MKV with Perian installed
Q: MKV video files won't play in QuickTime with plugin Perian. I downloaded some MKV files but they couldn't open via QuickTime with plugin Perian installed on Mac. I thought QuickTime would work with MKV videos. MKV is a container format like MP4 and AVI. The reasons why QuickTime is not playing MKV are similar to that of QT not playing AVI files. To play MKV on Mac, try other MKV players for Mac or change MKV to MOV with H.264 codec that is widely accepted.
Check compatibility
You can upgrade to OS X El Capitan from OS X Snow Leopard or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
MacBook introduced in 2009 or later, plus MacBook (13-inch, Aluminum, Late 2008) MacBook Air introduced in late 2008 or later MacBook Pro introduced in mid 2007 or later Mac mini introduced in early 2009 or later iMac introduced in mid 2007 or later Mac Pro introduced in early 2008 or later Xserve models introduced in early 2009
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with OS X El Capitan, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download OS X El Capitan
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.
If you still need OS X El Capitan, use this link: Download OS X El Capitan. A file named InstallMacOSX.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallMacOSX.pkg.
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Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installation
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After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X El Capitan.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
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Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both OS X and related updates to your Mac firmware.
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OS X El Capitan won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.