I take it I can't manage Drupal 7 sites with drush 9 so I'm trying to install Drush 8. But first I have to remove 9.
composer global remove drush/drush but it gives errors:
drush is not required in your composer.json and has not been removed Package "drush" listed for update is not installed. Ignoring. Loading composer repositories with package information Updating dependencies (including require-dev) Nothing to install or update Generating autoload files
I know it is installed because drush -version lists 9.7.1