Generally, the system is designed to support one Vertabelo Client per user account. It was an architectural decision to simplify the whole process of setting things up. We're aware of this trade-off that users cannot have more than one Client at the time and cannot manage them (activate and deactivate).
That said, there's a workaround for this. You can copy your "config.json" configuration file (you'll find it in the directory Vertabelo Client is installed in) to another machine. This way you can pretend that there's only one Vertabelo Client while in fact there are two or more. Please note that only one Vertabelo Client may be connected to Vertabelo at the same time.
I hope this helps. If you have any questions please let me know.
Customer support service by UserEcho