A: Dear Aali
There are to main differences:
1) The number of machines or devices on which you can use your license key to activate RTILA Studio at one given point
2) Plan 6 gives one additional feature which is the reseller rights and unlocking of Standalone Bots you can compile so you can sell them and they can be used third party computers (below Plan 6 the Standalones would only work on the computer that compiled them)