This plugin let's you add a gallery of Vimeo-videos to your site, displaying thumbnails for each video. With Thickbox or Shadowbox JS installed …

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Vimeo SimpleGallery" folder is added on left sidemenu. Now, Click on "Vimeo SimpleGallery" folder.

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

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

Guide

Guide
Unzip the archive Upload the folder “vimeo-simplegallery” to “/wp-content/plugins/” Activate the Plugin in the WordPress Dashboard Change settings on the Options page (or use standard settings) Download and install Thickbox or Shadowbox JS if you want to show videos in a box on your site. To add a Vimeo SimpleGallery to a page or a post, simply use the following code: `[vimeogallery]`

Unzip the archive
Upload the folder “vimeo-simplegallery” to “/wp-content/plugins/”
Activate the Plugin in the WordPress Dashboard
Change settings on the Options page (or use standard settings)
Download and install Thickbox or Shadowbox JS if you want to show videos in a box on your site.

To add a Vimeo SimpleGallery to a page or a post, simply use the following code:

[vimeogallery]

each, thumbnails, video, thickboxor, installed, shadowbox, displaying, site, gallery, lets,

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Reffered: https://wordpress.org/