The license is already assigned to a project. Go to your site and log in. Open up the Dashboard and click on 'Extend concrete5'. You will then see your newly bought theme 'Dark Wall' being ready for download and install.

If you want to download the source files to your computer you will have to release the license from your project before you can download it.

Thank you for your reply.

I´ve just tried what you said and it still don´t work

It does not appear in the window

Please see attached

Make sure your license is assigned to the right project. If you have several projects with similar names it might have been assigned to the wrong project.

Open up your projects in your c5 profile to find out which project has the license assigned.

Check if the licence is not assigned to another project by going to My Account > Projects > Name....
If it is then release it from the project.

It might also be there under the Add Item to this Project menu so you can assign it to the project if it never has been assigned to one.

You might also check this page to see if it is listed there at all:http://www.concrete5.org/profile/orders/...
If you see a "download archive" there then it definitly is not assigned to a project unless you have more then 1 licende of the theme