There is no limit to the number of different PCs where SmartPTT Dispatcher can be installed. You will use licenses only for the connection to the network. Thus, you can install SmartPTT Dispatcher on as many PCs as you wish, the restrictions apply only to the number of simultaneous connections.
For example, if you have 4 dispatcher licenses, it means you can connect a total of 4 dispatchers to a single radioserver at the same time. However, even if the number of connections is exceeded, you can still run the dispatcher application. It will not have access to SmartPTT server, but you can look through previously recorded data, make reports and listen to the recordings. What a good opportunity for analytics without disrupting the dispatchers from their work, right?