Sometimes its the files folder permissions where you have to set it to 755, however you can also check it with the drush login and then check in the permissions.
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Pascal Pivaty
On
Thanks for your responses but I found the answer!
For some reason, the "Anonymous user" role was removed during the update.
I recreated one without forgetting to give it a machine name "anonimous" and everything is back to normal!
Sometimes its the files folder permissions where you have to set it to 755, however you can also check it with the drush login and then check in the permissions.