问题
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.
回答1:
Assuming a regular windows 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
And finally after performing any self-update, you can specify --rollback to go back to the previously installed version.
composer self-update
composer self-update --rollback
回答2:
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
回答3:
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
来源：https://stackoverflow.com/questions/64597051/how-to-downgrade-or-install-a-specific-version-of-composer