It could be due to the reason that the server/ftp user doesn't have rights to write into the Mumara's installed directory and it was unable to overwrite the files/folders. Alternatively, you can download the latest script from your clientarea and upload/replace into the Mumara's root folder EXCEPT for the .env file. And once you are done, open the SSH terminal and run the following commands into the root directory
php artisan cache:clear
php artisan config:clear
php artisan route:clear
php artisan view:clear
Wasif Ahmad