Still broken as the [ [ backupcourse ] ] from your screen shot indicates.
Did you click on the 'more info' lnk? Where (url) did it take you?
So you had to manually create a backup folder at that location?
Wonder what other files/folders are missing in your moodle code directory?
In your backup folder, do you see all the other directories and files as in the
screen shot I provided? backup.class.php, + the other backupX.php files, the cc, controller, converter folders? import.php and log.php also?
if not upload those as well.
Let's hope these are the only missing folders/files from your migration. If there are, expect strange things to happen.
There are 46262 files and folders in a moodle 3.8 code folder. If you get more errors about files not found or other strange behavior, might be easier to preserve the config.php file you have edited in the current moodle code directory (so you don't loose it and your site info), and try the migration of code again.
'SoS', Ken