I have tried installing mosaico (after installing shoreditch and flexmailer). However it did't work so after searching stackexchange I thought I would install it from github which seems to be a later version than the one you install fromt he extension installer within civicrm. So I disabled and uninstalled. Version 1.0 still apppears on my extensions list, so I deleted the folder from my added extensions folder, and mosaico 1.0 still appears in my extensions page (with the option to install).
How is this possible?! How do I delete it fully to start again.
I cleared drupal cache and civicrm cache. I'm on CiviCRM 5.9.1 and drupal 7.