The Compatibility Checker states that you must have version 2.1v1 of
HyperCard in order to be compatible. This is not a valid version number
for HyperCard. The latest version of HyperCard is simply 2.1 and it is the
correct version to use with System 7.1.
However, labels on the outside of retail packages of HyperCard 2.1 may be
labeled in error as "HyperCard 2.1.1".
This article is adapted from the Claris Tech Info database.