Appointment Hour Booking is a plugin for creating booking forms for appointments with a start time and a defined duration over a schedule.

Noted That:

To install correctly this appointment-hour-booking.zip.
Fisrt Download the appointment-hour-booking.zip to your computer
Extract/Open appointment-hour-booking.zip to Your Computer.
Then, Find readme.txt file inside appointment-hour-booking.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "appointment-hour-booking.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "appointment-hour-booking.zip" Downloaded plugin from your computer, Where you downloaded appointment-hour-booking.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Appointment Hour Booking – WordPress Booking Plugin" folder is added on left sidemenu. Now, Click on "Appointment Hour Booking – WordPress Booking Plugin" folder.

Noted that: If you do not see "Appointment Hour Booking – WordPress Booking Plugin" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Appointment Hour Booking – WordPress Booking Plugin Configurtions and Settings or How to work "Appointment Hour Booking – WordPress Booking Plugin" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Appointment Hour Booking – WordPress Booking Plugin" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Appointment Hour Booking – WordPress Booking Plugin
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
To install Appointment Hour Booking, follow these steps: Download and unzip the Appointment Hour Booking calendar plugin Upload the entire appointment-hour-booking/ directory to the /wp-content/plugins/ directory Activate the Appointment Hour Booking plugin through the Plugins menu in WordPress Configure the settings at the administration menu >> Settings >> Appointment Hour Booking. To insert the appointment hour booking calendar form into some content or post use the icon that will appear when editing contents

Guide

To install Appointment Hour Booking, follow these steps:

Download and unzip the Appointment Hour Booking calendar plugin
Upload the entire appointment-hour-booking/ directory to the /wp-content/plugins/ directory
Activate the Appointment Hour Booking plugin through the Plugins menu in WordPress
Configure the settings at the administration menu >> Settings >> Appointment Hour Booking.
To insert the appointment hour booking calendar form into some content or post use the icon that will appear when editing contents

booking, defined, time, duration, over, schedule, start, appointments, hour, plugin,

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Reffered: https://wordpress.org/