Cost Calculator Builder WordPress plugin has two types, basic free, and pro versions. According to the version of it, the installation process will differ.
As it is a WordPress plugin, you can install it in two ways following:
Follow to Plugins > Add New from your dashboard.
Click on the Upload Plugin button and select the Cost Calculator Builder downloaded file from your local folders. Click Install Now and wait for the installation to finish.
After installing it successfully, you need to activate the plugin.
The second way of installation can be done directly in your WordPress Dashboard.
Go to Plugins > Add New from your dashboard and give the desired search.
From the results of the search box, install the plugin. After clicking the Install button, Activate button will appear. Click it for activation.
Please note that the Pro Version of the plugin works only if the Free plugin is activated on the website.
When all your data is found to be correct about your buying, you will get a welcome message by Freemius, sent to your email.
In that message, you will be aware of linking to Pro Plugin's download page with the license key to activate the plugin. You will also be informed of some personal data and instructions for activation.
Go to Plugins sections from your dashboard, then go to Add new and choose Upload plugin function from there.
Choose the archived file from the Freemius message. Then, click Install Now button.
The installation is complete.