Upgrade 2014 to 2015

hello all,
i have a question:
I have 2014 pro installed. i need 2015 pro to open a file.
so i need to upgrade. then i have to pay 95 dollars.
when i check my license information which i got send in an email some time ago.
it says Below is your SketchUp Pro 2015 license information!
Maintenance and support expiration date: 09/19/2015

so why cant i upgrade without paying? i already did right?

Probably i am doing something wrong. please help!

Thx!

G.

No just download SU2015, install it and use the license code from that mail.

Have you looked at this page?