Installing WP Ultimate Post Grid
Installing the free WP Ultimate Post Grid plugin
The free plugin acts as the foundation for the Premium version, so everyone must follow this step.
As the free plugin is hosted on the WordPress.org repository it can easily be installed right from your backend. Just go to the Plugins > Add New page, search for "WP Ultimate Post Grid", click on the "Install Now" button first and the "Activate" button next.
Alternatively, download the plugin from the repository and install it just like the Premium plugin.
Remove existing Premium plugin
Before you can install the Premium plugin you will have to delete any existing WP Ultimate Post Grid Premium plugin on your website.
Go to the Plugins page in your backend, deactivate first and delete the existing plugin as well. You will NOT lose any grids or other data by doing this, even though you'll get a warning message for that.
If you don't deactivate AND delete you'll get an error when trying to install the new plugin file.
Installing WP Ultimate Post Grid Premium
Make sure you've installed the free WP Ultimate Post Grid plugin and removed any existing paid plugin, as explained above.
After purchasing the plugin you'll receive an email with a download link for the plugin file. Another option is to download the plugin file from your account page.
Check if you have a .zip file archive of the plugin after the download. If not, follow these instructions to get a zip archive.
The plugin can be installed by going to the Plugins > Add New page (like you did with the free plugin) and then clicking on the "Upload Plugin" button near the top. Click on "Choose File" to select the plugin zip file, then "Install Now" and "Activate".