Horje
Automatically redirect page not found errors (404s) when the slug matches (for permalink changes), when a very similar name match is found, or always …

Noted That:

  • To install correctly this 404-solution.zip.
  • Fisrt Download the 404-solution.zip to your computer
  • Extract/Open 404-solution.zip to Your Computer.
  • Then, Find readme.txt file inside 404-solution.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 Tips Below.

Start the Tips:

1. First Download "404-solution.zip" Plugin to your Local Computer. (Click Download)

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

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

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

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5. Now, Browse "404-solution.zip" Downloaded plugin from your computer, Where you downloaded 404-solution.zip According to Step – 1 Above then, click on "Install Now"

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6. Now, Click on "Active Plugin"

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7. Then, See left sidemenu. "404 Solution" folder is added on left sidemenu. Now, Click on "404 Solution" folder.

   Noted that: If you do not see "404 Solution" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about 404 Solution Configurtions and Settings or How to work "404 Solution" in your WordPress site.

 

oR

After Activated Plugin According to Step-6 then,

  1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
  2. or Direct go to: https://yourdomain/wp-admin/plugins.php
  3. Then, Find "404 Solution" Activated Plugin from Plugin List.
  4. Then, Click on "Settings" from Plugin that is 404 Solution
  5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,
WP Plugin Setting


Guide
  1. Unzip the files and upload the contents to /wp-content/plugins/.
  2. Activate the plugin.
  3. Use the Settings -> 404 Solution options page to set the options.
Reffered: https://wordpress.org/