How to upgrade or downgrade install a specific version of Composer?

 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

Magento 2 all types

 Magento 2 is available in different editions based on business needs. Here are all the types of Magento 2 : 1. Magento Open Source (former...

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