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1. Unzip the file you downloaded (wp-easybooking.1.0.1.zip).
2. Upload the 'wp-easybooking' folder to the '/wp-content/plugins/' directory.
3. Activate the 'Easy Booking' plugin through the 'Plugins' menu in WordPress.
4. Activate the 'Easy Booking Widget' widget through the 'Plugins' menu in WordPress.

Please make sure that you first activate the plugin and then activate the widget.

You can find more information here http://wp-easybooking.com/content/6-install-plugin, and instructions on how to set up the plugin here http://wp-easybooking.com/content/7-settings. You can also read this information at the instructions.pdf file.