Adobe Premiere codec missing

Ask whomever you are delivering Photo-JPEG QuickTime to if you can modernize to H264 or Apple ProRes422 (LT).

If not, you may need to keep a Mac around running macOS 10.12 Sierra (or older) and video edtiing software that still uses QuickTime as a system driver for time based media.  An alternate boot drive for your current Mac would work as well.  If you only need to export a few files, QuickTime Player Pro will allow you to export an Apple ProRes422 edited master that came from Premiere Pro to Photo-JPEG QuickTime.  Running older Adobe software gets tricky unless you happen to have the non-subscription version like CS5, CS5.5 or CS6 (if you go older, you may have to roll back to an older macOS as well).  Final Cut Pro classic and Compressor clasic run fine under macOS 10.12 Sierra.

This information can it be useful 

https://helpx.adobe.com/x-productkb/multi/quicktime7-support-dropped.html

InninArt,

I feel your frustration. Sorry. See if you can use a third party encoder to transcode these items. Older versions of Premiere Pro may also work, but are no longer supported, so we cannot recomeend that route any longer (officially).

Best,

Kevin

It was many years ago i used Photo-JPEG, but have you tried this?