PROBLEM
When ArcIMS is installed to a location with \ArcIMS in the path, for example C:\Program Files\ArcIMS, ArcIMS Service Packs cannot be installed.
During the ArcIMS product install, \ArcIMS is appended to the installation location. If the location selected during installation includes ArcIMS in the path, an additional ArcIMS is appended to that path and the registry key that goes along with it, for example C:\Program Files\ArcIMS\ArcIMS.
Get help from ArcGIS experts
Download the Esri Support App