Why wont my extension update using composer?

Question

I am trying to update Amasty Layered Navigation. Following their documentation it says to type in the command-

composer update amasty/shopby

When I do that it says

Package "amasty/shopby" listed for update is not installed. Ignoring. 

It is installed and functions properly. When I run a status to see if it is enabled it is in there. Am I using the wrong command?

I can see the repo username and password in the auth.json file.

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Update:

The extension was originally installed by ftp, meaning I had to update by using ftp. If anyone knows how to update an extension with composer after installing with ftp I would be curious.

Answer 1

The extension was originally installed by ftp, meaning I had to update by using ftp. If anyone knows how to update an extension with composer after installing with ftp I would be curious.

Remove the files from app/code, then use composer to install the new version:

composer require amasty/shopby