

Going forward, when upgrading Creative Cloud apps, use 'Advanced Options' in the Desktop app to retain older versions rather than the default behavior, which is removing them. At a minimum, you'll need both the Premiere Pro and Adobe Media Encoder apps.

You could possibly use either backup to get back to where you were before.

Use a system backup or image from when you had CC 2017 installed.To prevent that changing, when upgrading Creative Cloud apps, use 'A dvanced Options' in the Desktop app to retain older versions rather than the default behavior, which is removing them. These back up versions will restore your machine to it’s previous state. On a Mac, you'd use Apple's Time Machine. On Windows, try to use Windows Restore to roll back the state of applications on your computer to before that time. If you can't move to the lastest OS and CC2018 application version, recovering your CC2017 application including Dolby functionality is another potential path. Recover your CC2017 versions that included Dolby.Rename the files and reimport them into Premiere Pro. E-AC-3 with Joint Object Coding (Dolby Digital Plus Atmos). If you need to migrate work in progress, use a third-party utility like Handbrake (a free open-source video transcoder) to convert your MTS/ACS files. Object-based audio engine and codec pack with Dolby Atmos rendering, room correction, HRTF.
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All windows versions above Windows 8.1 and Mac OS 10.11 or above contain native support for Dolby decoding functions.
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You can find instructions on how to fix this issue in the following article on the Microsoft support site: Media feature pack for Windows 8.1 N and Windows 8.1 KN editions. Windows 8.1N/8.1KN: Windows 8.1N/8.1KN version does not include the media package required to decode AC-3.You can find instructions on how to fix this issue in the following article on the Microsoft support site: Media feature pack for Windows 10 N and Windows 10 KN editions. Windows 10N/10KN: Windows 10N/10KN version does not include the media package required to decode AC-3.If you run a Windows operating system on your computer, all recent versions now support some form of Operating System (OS) level decode for Dolby audio.
