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Under certain circumstances, the following error may occur when upgrading to DocuWare 6.12 (C:\ProgramData\DocuWare\SetupLogs\DWSetup.log):
"DocuWare.Common.Exceptions.DWDBException: Expression type int is invalid for COLLATE clause."

This malfunction has been fixed and the DocuWare 6.12 Setup has been updated on 2017-11-25.
Please download the updated DocuWare 6.12 setup and run the upgrade again:
Download DocuWare Version 6.12