How to fix the installation problem
Please note
This is a temporary problem and it will be fixed very soon.
The new version of the Phlox Core Elements has been submitted to the WordPress repository and it will be available to download soon which will take care of this problem as well.
For now, you can fix the problem by manually installing the Phlox Core Elements. Please do the following steps.
1- Download the Phlox Core Elements zip file.
2- Navigate to Plugins > Add new and click the Upload plugin button:
3- Select the downloaded file and click "Install Now".
3- After the installation, click the "Activate Plugin" button and it's done.
4- Repeat the same process for the Phlox Portfolio plugin.
5- You can continue with the installation and the license activation process without any problems.