You can find the answers to many questions here, it’s very likely someone before experienced the same problem as you do. Otherwise you can also submit an issue ticket and wait for our help.
Yes you can as long as you're the only person using it on all computers.
When the software is used by the same person we don't require additional licenses for other computers/laptops etc. It's very common that our users use plug-ins on 2/3 machines simultaneously.
Use the search or contact our staff:Submit a ticket