Download the PaddlePay plugin .zip file from the source you received it.
In your WordPress admin, go to Plugins → Add New → Upload Plugin.
Click Choose File, select the .zip file, and click Install Now.
Once installed, click Activate.
Download the PaddlePay plugin .zip file and unzip it.
Connect to your server via FTP/SFTP.
Upload the extracted folder to:/wp-content/plugins/
Go to Plugins in your WordPress admin and click Activate under PaddlePay.
Post-Installation
After activation:
Ensure WooCommerce is active.
Follow the How to Connect Paddle guide to configure your credentials.
Test your checkout in Sandbox mode before going live.