无法运行作曲家自我更新：“phar 签名与您下载的文件不匹配”

Question

The system is windows10 Enterprise

I installed composer; its version is 2.0.8

My symfony 4.4 does not launch with this version of composer; so I decided to downgrade composer with this command: composer self-update --1

But I get error:

The phar signature did not match the file you downloaded, this means your public keys are outdated or that the phar file is corrupt/has been modified

So how to fix this?

Answer 1

Try executing:

composer self-update --update-keys

to update your public keys, and rerun the self-update command.

If that doesn't work, your phar file is really corrupted, and you'll need to download again. Just grab the appropriate file from the "Manual download" section of the download page and overwrite your local composer copy.