IMPress for IDX Broker is part of the IMPress family of plugins. Your IDX Broker-enabled account provides this plugin with access to your MLS data fee …

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "IMPress for IDX Broker" folder is added on left sidemenu. Now, Click on "IMPress for IDX Broker" folder.

Noted that: If you do not see "IMPress for IDX Broker" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

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

Guide

Guide
Download and extract the IMPress for IDX Broker plugin. You may also install directly by going to your WP-Admin page and then Plugins > Add New. Search for ‘IMPress for IDX Broker’ under new plugins and click to install directly. Upload the uncompressed folder to your `/wp-content/plugins/` directory. Activate the plugin through the Plugins menu in WordPress. Confirm you are using a version of PHP later than 5.2. You will also need to have an active IDX Broker account for the plugin to work. If you have an account, simply go to the IMPress for IDX Broker plugin page within WordPress, enter the API key provided via your setup email, and click the ‘Save Changes’ button. Your plugin will now pull your IDX Broker account information into WordPress.

Download and extract the IMPress for IDX Broker plugin. You may also install directly by going to your WP-Admin page and then Plugins > Add New. Search for ‘IMPress for IDX Broker’ under new plugins and click to install directly.
Upload the uncompressed folder to your /wp-content/plugins/ directory.
Activate the plugin through the Plugins menu in WordPress.
Confirm you are using a version of PHP later than 5.2. You will also need to have an active IDX Broker account for the plugin to work. If you have an account, simply go to the IMPress for IDX Broker plugin page within WordPress, enter the API key provided via your setup email, and click the ‘Save Changes’ button.
Your plugin will now pull your IDX Broker account information into WordPress.

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Reffered: https://wordpress.org/