Thanks, Neil. There wasn't an advanced options dialog for Mac, though I didn't use the CC updater app, I used a .dmg from the download page. Anywho, it installed fine and left my PP 2017 intact. Unfortunately, however, same problem. AVCHD video is actually fine and in the original place but the audio is completely wrong and referencing different parts of different clips. The audio waveforms that do show up all appear to be of the original and correct audio, and all of my audio keyframes are still there, it just doesn't play the right audio. Also no dynamic links to After Effects work (though I didn't install AE 2019). From reading past comments from others with this issue, it appears it may have been my fault for not bringing in the whole file structure of the SD card. But it's years too late to correct that and what's done is done. The messed up clips happened both when copying an old project's entire contents into a new project as well as trying to open an old project directly with PP 2019. It looks like if I want to be able to access any old projects I'll have to stick with CC 2017 forever...
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