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Can I install different versions of different ArcGIS products on the same machine?
No. There are multiple ArcGIS products; ArcInfo, ArcEditor, and ArcView, with multiple versions for each; 8.0.2, 8.1, 8.1.2, 8.2, 8.3, 9.0 etc. When installing more than one ArcGIS product on a machine, the same version number of every product must be installed.
This also applies to ArcInfo Workstation and ArcGIS Desktop; for example, the computer cannot be installed with ArcInfo Workstation 8.x and ArcGIS Desktop 9.0. The versions must be the same.
See the Related Information section for examples.
The information in this article does not apply to ArcView 3.x