Purchase Capture One Pro here
Capture One is available in different versions and can be purchased on-line at the Capture One Online Store or from one of the Software Dealers listed at web site.
It is recommended to run the software in Trial Mode for 30 Days before deciding to purchase.
The PRO version will install for a 30 Day Trial period.
Once a Trial has expired, a 2nd Trial of the same version is not possible.