How to downgrade or install a specific version of Composer?

Php Problem Overview

I'm getting the following error in a project I'm setting up:

> You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.

I've started at a new company this week, just trying to get their projects installed and there doesn't seem to be a way to change my composer version on Windows. I'd rather not update all their packages as I'm not familiar with the projects yet and have no clue what kind of implications go into that.

Php Solutions

Solution 1 - Php

Assuming a regular composer installation, to rollback to version 1 of composer, you simply execute:

composer self-update --1

When you want to go back to version 2 (which you should, after updating or removing the incompatible plugins):

composer self-update --2

The above will take you to the latest on any of the two major versions.

You can also "update" to a specific version just by passing the version number to self-update:

composer self-update 1.10.12
composer self-update 2.0.7

After performing any self-update, you can specify --rollback to go back to the previously installed version.

composer self-update
composer self-update --rollback

Finally, if you are feeling adventurous, you can update to a pre-release version by executing:

composer self-update --preview

Solution 2 - Php

If you have already installed composer on your system. then paste the below code to downgrade the composer version with a specific version as per your need.

composer self-update 1.10.14

for ubuntu system use the below command

sudo -H composer self-update 1.10.14

Solution 3 - Php

Just two commands worked for me. Currently I have composer 2.x.x , I had 1.10.x . First one command will download downgrade version and then second command will rollback to 1.x.x

php composer self-update --1
composer self-update --rollback

Solution 4 - Php

I found a flag in composer installer "--1" and "--2". I'm using this command inside of my Dockerfile:

curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer --1

Solution 5 - Php

You can use following code for update to specific versions

composer self-update 1.10.12
composer self-update 2.0.7

composer self-update --1 or 2

Content Type	Original Author	Original Content on Stackoverflow
Question	Brendan Strong	View Question on Stackoverflow
Solution 1 - Php	yivi	View Answer on Stackoverflow
Solution 2 - Php	Pratik Bharodiya	View Answer on Stackoverflow
Solution 3 - Php	Amir Khan	View Answer on Stackoverflow
Solution 4 - Php	Sergiu Savva	View Answer on Stackoverflow
Solution 5 - Php	Rajath Kamal	View Answer on Stackoverflow