"...you have to wait to start a new session" I thought i could just restart the program, write the captcha and then run it again. But right now i have to wait another 15 min to start it again...

To fix you”re problem. You should go to this link and purchase one of @Droidz lovely Wrobot key”s at a good yearly or monthly what ever you think you’ll need rate. (No refunds.) https://wrobot.eu/store/category/2-wrobot/

Better off just purchasing software for the software to work. :)

i've got one wrobot licence. is it able to to use the main licence with 4 other Trial bots to use multiboxing in party mode ?

Im not sure, but i read wrobot rotation and party mode arent limited.