Theme Tweaker lets you modify the colors in your theme with no CSS/PHP editing.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Theme Tweaker" folder is added on left sidemenu. Now, Click on "Theme Tweaker" folder.

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

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

Guide
Searching The easiest way to install this plugin is to use the WordPress Admin interface. Go to your admin dashboard, find the “Plugins” menu, and click on “Add New”. Search for this plugin and click on “Install Now” and follow the WordPress instructions. Uploading If you want to download it and manually install, you can again use the WordPress dashboard interface. First download the plugin zip file to your local computer. Then go to your admin dashboard, find the “Plugins” menu, and click on “Add New”. After clicking on the “Add New” menu item as above, click on “Upload” (below the title “Install Plugins” near the top). Browse for your downloaded zip file, upload it and activate the plugin.

Guide

Searching

The easiest way to install this plugin is to use the WordPress Admin interface. Go to your admin dashboard, find the “Plugins” menu, and click on “Add New”. Search for this plugin and click on “Install Now” and follow the WordPress instructions.

Uploading

If you want to download it and manually install, you can again use the WordPress dashboard interface. First download the plugin zip file to your local computer. Then go to your admin dashboard, find the “Plugins” menu, and click on “Add New”. After clicking on the “Add New” menu item as above, click on “Upload” (below the title “Install Plugins” near the top). Browse for your downloaded zip file, upload it and activate the plugin.

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Reffered: https://wordpress.org/