The MapSpeller 4.0.4072 extension is for, and requires, ArcMap 10.0. Other
versions of MapSpeller exist for different versions of ArcMap (higher or
lower). MapSpeller works with either the concurrent or single user
version of ArcMap.
Hard disk space and in-memory requirements are
minimal. The download installation package is about 22 MB.
extension is an ArcMap Just-In-Time extension (JIT). This means that
while the toolbar is available at all times, it virtually doesn't consume
any CPU or memory resources until users actually interact with it.