need advice...I have that Series 60 themes studio for my N 90. I also manage to create a theme on my computer. But everytime, when I try to check out. Ist asks for a key and a certificate. As I don't know much about computers, I don't know how to do that. I also read the other posts, but I didn't understand very much. Could someone please explain in simple (!!!) language how to create a sis file...Thank you 😉