This plugin uses Javascript to dynamically expand or collaps the set of months for each year and posts for each month in the archive listing.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide

Guide
IMPORTANT! Please deactivate before upgrading, then re-activate the plugin. MANUAL INSTALLATION Unpack the contents to wp-content/plugins/ so that the files are in a collapsing-archives directory. Now enable the plugin. To use the plugin, change the following here appropriate (most likely sidebar.php): Change From: To something of the following: `\n"; wp_get_archives(); echo "\n"; } ?>` You can specify options for collapsArch. See options section. WIDGET INSTALLATION For those who have widget capabilities, (default in WordPress 2.3+), installation is easier. Unzip contents to wp-content/plugins/ so that the files are in a collapsing-archives directory. You must enable the Collapsing Archives plugin, then simply go the Presentation > Widgets section and add the Collapsing Archives Widget.

IMPORTANT!
Please deactivate before upgrading, then re-activate the plugin.

MANUAL INSTALLATION

Unpack the contents to wp-content/plugins/ so that the files are in a
collapsing-archives directory. Now enable the plugin. To use the plugin,
change the following here appropriate (most likely sidebar.php):

Change From:

To something of the following:

 \n"; wp_get_archives(); echo "\n"; } ?>

You can specify options for collapsArch. See options section.

WIDGET INSTALLATION

For those who have widget capabilities, (default in WordPress 2.3+), installation is easier.

Unzip contents to wp-content/plugins/ so that the files are in a
collapsing-archives directory. You must enable the Collapsing Archives
plugin, then simply go the Presentation > Widgets section and add the
Collapsing Archives Widget.

each, year, posts, archive, listing, month, ofmonths, javascript, uses, dynamically,

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Reffered: https://wordpress.org/