If not otherwise stated in the License text attached to the downloaded files, all themes are subject to the following terms

You can use the source code to create one Project (a website) for yourself or for a client of yours. The project itself may be sold.

You can edit every piece of the given code to your liking.

If you create a project for a client, the License is then transferred to your client.

You may create on instance of a customized version with this theme, but not more than one.

You can't redistribute the theme as a theme (i.e. reselling with the source files included).