How do I totally revert to an earlier ver. of QT?

My last post spoke of non-audio issues in 7.69, how I trashed and re-installed from a fresh download from the Apple site and how the app never appeared in the Applications folder. Yet when I tried installing an earlier ver. I was told I had a newer one installed.
A reply led me to install and run Pacifist, a shareware program used to open and mount apps from a pkg file. I did that - it overwrote all the core elements of QT 7.69 with the earlier [7.55] vers. I was trying to install and the app installed successfully, so it seemed. However when I ran it to play an avi file there was still no audio. These files play fine in other apps like MPlayer so there is nothing wrong with the actual video files - and further they all +did play+ in QT before upgrading to 7.69. Any ideas? Thanks

OK - I get that - and in fact Perian was installed previously, - but that should not have anything to do with audio playback right?
As previously indicated, it depends on the audio compression format and whether it is natively supported by QT. For instance, VBR MP3 (a common AVI audio track format) support for AVI files is provided by Perian. (See Perian package description.) AC3 is another possibility here.
As far as audio compression goes, not sure how to find that out - I did not generate the original files.
If the file opens in an particular media player, check the app's "Inspector" or "Info" window to learn what audio and video codecs were used to create the file. If the file will not open, check the Finder "Info" window for this information. This is always the first step in attempting to solve playback issues since you must have the same codecs available for playback.
ADDED:
Posted above info for explanatory reasons...

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