Hi BPGFM and Chavdar,
I was having the same issue I have the paid unlimited version. My hosting is Hostinger. So simple trial and error solved my issue. I deactivated all other default plugins except all in one wp migration and all in one wp migration extension.
Then uploaded the backup file to website folder wp-content/a1wm-backups
Then go to wordpress dashboard to all in one wp migration and backups
Then select your backup and restore.
so restoring instead of importing solved the issue like magic.