It is very simple to install it.
Please go through the following process.
1. Make sure you have a zip file of premium version of theme after payment. You can download this file either from the download link that is given in the purchase receipt which is sent to your registered email or download it directly from postmagthemes.com. In the case of download from postmagthemes.com, please login to postmagthemes.com with username that you have created during purchase and goto profile >> purchases. Here you can again download it. Sometimes due to security reason your system unzip it and provide you unzip folder. In this case, pleases make it zipped again.
3. Then Go to appearance >> theme >> add new theme >> upload theme zip file. Do NOT unzip and NOT try to upload folder.
4. After successful upload, please install and then activate it.
5. Now remain is configuration, there are many documents as per your requirement. Please follow them to configure it.
But if you think it is still difficult to setup then please make a new username with admin right and send it to us with your site link. You can delete such username later. We will setup it for 15$.