Hmm, it shouldn't do this. The computer that you have shouldn't matter since Java is a massively cross-platform system (and OSBot runs on Java). After you enter your OSBot username and password and press 'Launch', It should show up like this:
You can then press 'Add bot' at the top left, then you should be able to log in and start the script.
I'll direct you to the support section where you can find more information about the client, current bugs/issues, and the refund process: https://osbot.org/forum/forum/64-support-section/
-Apa