Hi Imran,
It needs R19 or older:
Scene Updater plugin loads old scene files and updates them to load in R20 or higher.
This Plugin should only be installed in versions of Cinema 4D R19 or Older.
With Cinema 4D R20, the ability to load scenes, that got saved with Cinema 4D versions older than R12, has been removed.
Please note that some older scenes might have used C.O.F.F.E.E. plugins, which are not supported any more in the newer versions. Also, any active plugin used in older versions needs to be available and compatible with the older and now converted files, when used in recent versions.
If you have a file that doesn’t load, I can always have a look into it [Q&A forum].
All the best