Well I had this problem and found no old version except possibly on line which did not work when extracting them. I have an older tablet with an older andriod version of xfinity that I had to reset and then lost the xfinity stream app because the new version on the app store would only work on the latest android version 7.0+
So what I did was download an APK extractor on a tablet that had the older version for android and then put an apk installer on the tablet I had to reset. Once I got the tablet to accept the file on a bluetooth transfer between the tablets I was able to install the aolder app and get the app to connect to xfinity.
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