Is it possible to install more than one instance of Statistica on the same machine/server?

Concurrent or Server (Enterprise) Installs
Technically, you can only install one instance of Statistica per machine/server eg. Live Score, WebStatistica.  

It is not recommended to have more then one instance of Statistica on the same machine/server. It is better to keep these isolated from each other so they do not affect each other. If more than one instance of Statistica was installed on the same machine/server, they would affect each other and it would not be possible to independently operate these.

It would be possible to install two instances of Statistica on the same machine/server if they were on different Virtual Machines hosted on the same physical server. 

Stand-alone Desktop Installs
Is is possible to have two Statistica stand-alone desktop installs, that of different versions.  For example, Statistica 13.3.1 and 13.2 can be installed side-by-side on the same machine and will function correctly.  See Statistica Version Management (Version Manager) for more details.