I wish to be able to develop against both ArcGIS Engine 9.3 and 10.2, so that for example, an application could depend on either at runtime.
Are there any issues with having the SDKs for both on a developer PC?
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Can ArcGIS 10 be installed on the same machine as ArcGIS 9.3.1?
No. For users who want to install ArcGIS 10 and ArcGIS 9.3.1 on the same machine, Esri recommends using a virtualization tool (such as VM Ware's VM Workstation or Microsoft's Virtual PC) and install the new instance of ArcGIS on that virtual machine.
We had initially announced that we would be able to support running ArcGIS 10 and ArcGIS 9.3.1 on the same machine. However, we were not able to accomplish this for ArcGIS 10.
The following drawbacks to trying to do this have been suggested to me:
So to develop a .NET library that could depend on either version of ArcGIS is going to require (at least):