The problem you are experiencing occurs only with the HyperCard 2.3.5
Updater included on approximately 10,000 CD-ROMs distributed at MacWorld
Boston in August 1996. The CD-ROM with the troublesome HyperCard updater
is titled "The Apple Services CD - August 1996 Edition".
The issue only occurs on Power Macintosh or native or fat binary versions
of the HyperCard 2.3 or 2.3.3 application. If you originally did an Easy Install of HyperCard 2.3 or 2.3.3 on your Power Macintosh, a few non-critical
resources were left out of the HyperCard application. If you performed a
custom install, these resources are included.
When you try to use the updater to update the HyperCard application that
does not have these resources, the HyperCard 2.3.5 Updater will not
recognize the application and will fail to update it returning the message
"An error prevented the update from completing. Invalid file selected for
updating."
To resolve this issue, you can re-install HyperCard 2.3 or 2.3.3 using the
Custom Install option, and then use the HyperCard 2.3.5 Updater. Alternatively, you can download the corrected version of this updater from
http://www.info.apple.com/swupdates/.