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I know there's no built-in way to save a v9 file back to v8 format. But, being curious (and procrastinating starting a new project) I tried something, and it worked - at least in my 2 trials. Knowing that the cptx files are just zip formatted files (like pptx, etc.) here's what I tried:
I tried this with both a very simple file started in v9, as well as a complex file (video, actions, quiz, etc.) that was started in v8, but finished in v9. (I did notice that the version number in the info.cpi file of the simple v9 file was listed only as 9.0..223 [missing a 0] but changing it to the full v8 number still worked.) The complex one even had knowledge check questions - they got converted to normal quiz questions. So far, I haven't found anything else in that file that didn't convert properly.
I'd be curious if someone could replicate this. I also haven't tried a responsive project.
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Could work as long as you don't use new features that have changed a lot. For this conversion, I wonder how states/styles for shape buttons created in CP9 will convert to CP8, I expect more issues for those than for Knowledge slides (which had a workaround that is now built in). Same for Effects, what happens with the new motion effects if it is a responsive project? Just some ideas, and too bad I don't have time to explore your workaround myself this weekend, I'm a bit too busy.
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It definitely won't be perfect, but it's nice to know that it would at least get that far. Might save someone from completely starting from scratch.
I don't have any extensive responsive projects to test with, and haven't converted anything over to multi-state yet.