1 pointRestored the CubeCart_filemanager table by merging two backup files? Which two? Having duplicate primary values seems to suggest that two backups of that one table was used, when only the latest should have been used.
1 pointThis appears to be a case where the file_id values in the CubeCart_filemanager table got renumbered somehow. I think your best approach to this is to download the backup that CubeCart made on the upgrade attempt, extract the SQL dump for the CubeCart_filemanager table, and see if there is a record with file_id of 15725 there. (It's all plain text, so a competent text editor should be able to search for 15725.) If that record is there, then I suggest you replace the existing table contents with the SQL structure and contents for that table you just extracted.
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