Premiere Pro may fail to import or show an importer error on certain Windows 10 (build 1809) configurations.
ArriRaw or MXF files may fail to import or show an importer error on certain Windows10 (build 1809) configurations when you first launch Premiere Pro after a new installation.
This issue has been seen when using Premiere Pro with systems having the following configurations:
Close and restart Premiere Pro. You can also upgrade your Windows operating system to Windows10 (build 1903 or later) to completely resolve the issue.