No. All ArcGIS components need to be the same version of 8.x. For example, if you already have ArcView Single Use 8.1 and ArcInfo 8.1 installed, you cannot install only the upgraded ArcView 8.1.2 Single Use and leave the ArcInfo 8.1 installed. If you attempt this installation, the ArcView 8.1.2 setup will ask you to completely uninstall all ArcGIS components before you install the upgrade.
If you have received your ArcView 8.1.2 Single Use upgrade but have not yet received the 8.1.2 ArcInfo upgrade then wait to make the upgrade until you have the installation media for all 8.1.2 components that you intend to use.
- ArcMap 8 x
- Legacy Products