on the page with the zoom plug-in download, it says that it works with 2.5 beta 3, which can't be downloaded anywhere. its not in the joomla source forge, not on the zoomgallery page, not here.
also can't find any Zoom manual which is really nerve racking because I see references to it in Forum posts, but can't find it anywhere.
it seems developers do this all the time... upload great components and very little or hard to get documentation.
If you still haven't found it you gotta go to the zoom website www.zoomfactory.org/ and click on DOWNLOADS... then DL the newest version. They recently relased a new version. THat should work... it did for me
2,5 beta 3 is NOT available on the downloads page at zoomfactory. I've been searching for that specifically because Peter Mixt's plug-in (for CB ) specifically says that version is necessary. but it doesn't seem to be easily available.
from the Plugin installer:
CB Zoom Tab provides a User Tab for displaying images added by a user. IMPORTANT: ONLY FOR Zoom 2.5 b3 and newer. This plug-in has parameters that need to set in the Tab Manager including NUMBER OF IMAGES to display, display IMAGE NAME and an additional text area.