Big Problem with my Capture One 9

I can't use my Capture One 9 since yesterday.

It says :

Your Capture One Subscription has been deactivated. To continue using Capture One please visit our store. For questions and inquiries please contact support.

and this is the current statement of my Macbook Pro and OS:

MacBook Pro (Retina, 15-inch, Mid 2015)

OS X El Capitan 10.11.6

I don't want to upgrade because I am totally happy with Capture One 9.

I want to make the payment to keep my license. Please help me get my Capture One 9 back.