Can not remove the Devel module While doing an upgrade to the Devel-module something went terrible wrong. Decided to remove the module through the "Uninstall"-tab. The module is however not listed there, while it's marked as active under the "Install"-tab. Removing the module manually (deleting the files) causes errors so I cannot do it this way either. 

Ironically I need this module to be able to re-install other modules which are outdated. Anyone got any feedback how to cleanly remove the Devel-module without the Uninstall tab?

I do not have Drush for D8, need another way as I got D6 and D7 instances installed on the same environment aswell.
Can't you use the "normal" upgrade scenario for FTP servers?
(I usume this still works btw. haven't tested it on d8 yet)
 - Download your intended version of devel from d.o.
 - Unpack the download
 - Upload to the server in place of the old devel module (so same paths,permissions,etc)
 - Run the "update.php" script to update the Database.(you need to be admin to do this, or change your settings.php to temp. allow anyone to do it).
 - Devel should be updated now.

according to the docs this should work see d.o. D8 Update a module