Event Tickets allows your visitors to RSVP and buy tickets to events on your site. Also works seamlessly with The Events Calendar.

Noted That:

To install correctly this event-tickets.zip.
Fisrt Download the event-tickets.zip to your computer
Extract/Open event-tickets.zip to Your Computer.
Then, Find readme.txt file inside event-tickets.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 "event-tickets.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 "event-tickets.zip" Downloaded plugin from your computer, Where you downloaded event-tickets.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Event Tickets" folder is added on left sidemenu. Now, Click on "Event Tickets" folder.

Noted that: If you do not see "Event Tickets" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Event Tickets Configurtions and Settings or How to work "Event Tickets" 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 "Event Tickets" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Event Tickets
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
From the dashboard of your site, navigate to Plugins –> Add New. Select the Upload option and hit “Choose File.” When the popup appears select the event-tickets.x.x.zip file from your desktop. (The ‘x.x’ will change depending on the current version number). Follow the on-screen instructions and wait as the upload completes. When it’s finished, activate the plugin via the prompt. A message will show confirming activation was successful. For access to new updates, make sure you have added your valid License Key under Events –> Settings –> Licenses.

Guide

From the dashboard of your site, navigate to Plugins –> Add New.
Select the Upload option and hit “Choose File.”
When the popup appears select the event-tickets.x.x.zip file from your desktop. (The ‘x.x’ will change depending on the current version number).
Follow the on-screen instructions and wait as the upload completes.
When it’s finished, activate the plugin via the prompt. A message will show confirming activation was successful.
For access to new updates, make sure you have added your valid License Key under Events –> Settings –> Licenses.

events, your, tickets, works, seamlessly, also, calendar, rsvp, allows, visitors,

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Reffered: https://wordpress.org/