This plugin inserts bootstrap 3 style grid layout block and a button block to the gutenberg editor.

Noted That:

To install correctly this rad-bootstrap-3-blocks.zip.
Fisrt Download the rad-bootstrap-3-blocks.zip to your computer
Extract/Open rad-bootstrap-3-blocks.zip to Your Computer.
Then, Find readme.txt file inside rad-bootstrap-3-blocks.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 "rad-bootstrap-3-blocks.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 "rad-bootstrap-3-blocks.zip" Downloaded plugin from your computer, Where you downloaded rad-bootstrap-3-blocks.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Rad Bootstrap 3 Blocks" folder is added on left sidemenu. Now, Click on "Rad Bootstrap 3 Blocks" folder.

Noted that: If you do not see "Rad Bootstrap 3 Blocks" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Rad Bootstrap 3 Blocks Configurtions and Settings or How to work "Rad Bootstrap 3 Blocks" 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 "Rad Bootstrap 3 Blocks" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Rad Bootstrap 3 Blocks
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Upon activation of the plugin, there will be a “Bootstrap 3 Block Settings” page added to the sidebar. This page has two configuration options which are by default enabled. These configuration options tell the plugin whether to load the required Bootstrap 3 styles in the block editor and or in your front end theme. If you already have bootstrap loaded in your theme and in the block editor, then you will want to turn these off. If you do not, however, you can include these here. This plugin will not load all of Bootstrap. It will only load the parts of Bootstrap needed by the added blocks in the editor. For this version of the plugin, this will include the grid layout styles as well as the button styles.

Guide

Upon activation of the plugin, there will be a “Bootstrap 3 Block Settings” page added to the sidebar. This page has two configuration options which are by default enabled. These configuration options tell the plugin whether to load the required Bootstrap 3 styles in the block editor and or in your front end theme. If you already have bootstrap loaded in your theme and in the block editor, then you will want to turn these off. If you do not, however, you can include these here.

This plugin will not load all of Bootstrap. It will only load the parts of Bootstrap needed by the added blocks in the editor. For this version of the plugin, this will include the grid layout styles as well as the button styles.

block, button, gutenberg, editor, layout, grid, inserts, bootstrap, style, plugin,

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Reffered: https://wordpress.org/