Good luck!
You indicated that the prior year data set had GLNBMC data files, which should only exist in company data that has been converted to Ledger 90A. This tells me that an attempt to convert the historical data was made and cancelled or failed. I believe there are more serious problems with the historical data than simply missing GLFSET data files.
Can you open the historical data with Ledger 81A? Does it pass an integrity check?
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Regards,
Softrak Tech Support