Great alternative for Google Maps plugins for WordPress. Add your custom map to your website easily with few clicks.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide

Guide
To install you must takes these steps Unzip folder with manualy downloaded plugin and upload the plugin files to the `/wp-content/plugins/` directory, or install the plugin through the WordPress plugins screen directly. Activate the plugin in the ‘Plugins’ screen in WordPress Find in menu “Maps” item and click it to add a map After enter street name, city and zip code click “Get Coordinates” to fetch proper coordinates to your location Choose color scheme of map and map pin Save map! If system couldn’t find location for your address you can drag and drop marker to proper localization. Save again! To place map on page copy generated shortcode which is visible on list of maps and paste to WYSIWIG editor

To install you must takes these steps

Unzip folder with manualy downloaded plugin and upload the plugin files to the /wp-content/plugins/ directory, or install the plugin through the WordPress plugins screen directly.
Activate the plugin in the ‘Plugins’ screen in WordPress
Find in menu “Maps” item and click it to add a map
After enter street name, city and zip code click “Get Coordinates” to fetch proper coordinates to your location
Choose color scheme of map and map pin
Save map!
If system couldn’t find location for your address you can drag and drop marker to proper localization. Save again!
To place map on page copy generated shortcode which is visible on list of maps and paste to WYSIWIG editor

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Reffered: https://wordpress.org/