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In AR 2018.4 I resored a v19 back up file, then upgraded offline to location My Library
Got the following error
Unsuccessful: Migration failure
Company File Name : C:\Users\Janet.kidson\AppData\Local\MYOB\Temp\artd 2018.MYO
Start Time : 09/01/2019 15:30:48 PM
End Time : 9/01/2019 3:30:50 PM
Source : UpgradeUtility
Method : ValidatePremierDataFile
Error : (UpgradeValidationError): The directory name is invalid.
The .myo file is in the directory C:\Users\Janet.kidson\AppData\Local\MYOB\Temp\artd 2018.MYO
Is it a problem with "My library" location
I understand from your post on most recent post Confirming Company File (Company File Code?) you have managed to upgrade a company file.
If you are still having trouble migrating that particular company file I would recommend restoring the file locally (right-clicking on the backup file and selecting Extract all) or, if already restored, move the company file to the desktop before selecting to upgrade that file. Do let us know if you require further assistance.