
When there're available update versions, you'll see Update buttons next to the apps. Save your work and close your Adobe apps, or you will receive a warning to close. Below are the steps to upgrade Premiere Pro to the latest version. It may lead to codec conflict and failure of reading some files. What's more, installing new codec may cause new problems. And, the import error may still persist even if you have managed to install HEVC codec. It says 'The importer reported a generic error'. However, not everyone can install HEVC codec successfully. This is because trial version doesn't recognize HEVC files.

If you're using a trial version of Adobe Premiere Pro CC, it is no surprise that you see 'codec missing or unavailable' error. It still cannot be fully compatible with HEVC videos. However, the well-known Adobe Premier Pro doesn't seem to keep up with this trend.

HEVC is getting increasingly popular and becomes the preferred codec to encode 4K recordings.
