It is not possible to install two versions of Bentley Map on the same machine. For example, Bentley Map V8i (SELECTSeries2) and Bentley Map V8i (SELECTSeries 4). You can however install different Bentley Map or OpenCities Map products on the same machines. For example, Bentley Map PowerView V8i SELECTSeries 4 and OpenCities Map Enterprise CONNECT Edition Update 3.
If a higher version of Bentley Map is detected during installation, then installing the lower version will not be allowed. If an existing lower version is detected, it will be upgraded to the higher version.
Should you find yourself in a situation where two versions are installed simultaneously, they you would need to initialize each in the Run as Admin... mode in order to register each package's components successfully, then reverse the procedure prior to initializing the other. In situations such as this, the mixture is not supported.