Or you can upload template zip package to the root Zen Cart folder with FTP client and unpack/extract it via your Cpanel of your hosting provider. And then select the new template in Admin -> Tools -> Template Selection.
You can find this info on every free template pages on 12leaves.com, for example:
http://www.12leaves.com/shop/html/li...te-p29789.html
Also you can get an additional assistants by contacting with them.



I only have to post my question, then the problem fixes itself!
My problem was not a problem, it just took some patience from my side. After about 5 minutes after I posted my problem, the webshop works fine with everything! Maybe the database had to think for a while? 

