Download the free version of the plugin from WordPress.org clicking on the "Download" button you can find in this page.
Go to your member area on yithemes.com.
Click on the "Download" button you can find in the related order you have made.
Install the plugin in your WordPress platform: add the .zip file you have downloaded in the WordPress plugins directory (wp-content->plugins).
You can also achieve the same result using the upload feature of WordPress to upload the Zip file.
Then click on the "Add new" option in you can find in Plugins, anc click on the "Upload Plugin" button.
After completing the upload of the plugin, you can activate it. Go to "Plugins", select the plugin and click on the "Activate" option.
License can be updated in "License" section in your reserved area of YIThemes, or in YITH Plugins -> License Activation on your site.
License updating occurs by the new purchase of the product related to the plugin. You only need to click "Renew" button: you will be redirected to yithemes.com and the product will be automatically added to cart.
Once updated, new license expiration date will be set to the same day and month of the next year. The only exception concerns those updatings done before the expiration date: in this case validity will be extended to one year from expiration date.
After purchasing, you don't have to do anything else. If in "YITH Plugins -> License Activation" expiration date isn't updated we suggest you to click "Update license information" button.